1

Louisiana Purchase (1803)

Image: Nik Shuliahin

It sounds crazy today, but the Louisiana Purchase almost doubled the size of the United States overnight. Thomas Jefferson, at the time, the third to occupy the position of President of the United States, bought the massive 828,000 sq mi territory from France for $15 million, securing vital land and resources.

The purchase, however, didn’t mean that the United States also gained control of the totality of the territory, as it was inhabited by Native Americans. But in any case, the acquisition paved the way for westward expansion, providing a vast area for exploration and settlement, while enhancing America's geopolitical influence.

2

Lewis and Clark Expedition (1804-1806)

Image: Charles Marion Russell

Commissioned by Jefferson, Meriwether Lewis and William Clark then embarked on a mission to map the newly acquired lands and find a viable route to the Pacific. Their legendary journey revealed the rich diversity of the western territories and established crucial relationships with Native American tribes.

Sacagawea, a Shoshone woman, played a crucial role as an interpreter and guide, helping the expedition navigate difficult terrain and gain trust with native tribes, significantly contributing to the mission's success. Ultimately, their detailed reports opened the frontier to future explorers and settlers.

3

The Oregon Trail (1811-1869)

Image: Dana Davis

Originally laid around 1811 by fur trappers and traders, the Oregon Trail soon became a critical route for thousands of emigrants moving west. Spanning over 2,000 miles from Missouri to Oregon, it was a perilous journey marked by harsh landscapes and, more often than not, disease.

Despite the hardships, the trail was improved to become passable by wagons, and it facilitated the mass migration of over 400,000 settlers during its peak, significantly contributing to the population growth and development of the Western United States.

4

California Gold Rush (1848-1855)

Image: Viviana Rishe

The discovery of gold at Sutter's Mill in 1848 triggered a massive influx of fortune seekers to California. The Gold Rush not only boosted the economy but also accelerated California's admission claim as the 31st state in 1850.

While prospectors initially used simple techniques like panning, the increasing complexity of gold extraction eventually required significant financing, favoring mining companies. And though the gold rush generated wealth worth tens of billions in today's dollars, only a few became rich; most participants earned little more than they had started with.

5

Homestead Act (1862)

Image: Kevin Butz

Signed by President Abraham Lincoln, the Homestead Act offered 160 acres of public land to settlers willing to farm it for five years. The policy primarily encouraged individual farmers who were looking to operate their own farms, as opposed to slave owners who sought to buy large tracts of land and use slave labor.

The legislation encouraged widespread migration to the Great Plains, accelerating agricultural development and expanding American settlements across the West.

6

Building of the Transcontinental Railroad (1863-1869)

Image: Johannes Plenio

The completion of the first Transcontinental Railroad in 1869 revolutionized transportation in the United States. Connecting the East and West coasts, it facilitated trade, travel, and communication.

The extensive railroad network was built by three private companies on public lands, financed with federal bonds and various subsidies. Instrumental in the nation's economic growth, the Transcontinental Railroad also helped forge a sense of national unity and identity in the American consciousness.

7

The Great Sioux War (1876-1877)

Image: Popular Graphic Arts

Also known as the Black Hills War, the Great Sioux War was a series of conflicts between the United States and the Sioux tribes. The war was sparked by the encroachment of settlers and gold prospectors on Native lands, a conflict that had been escalating since the early 19th century.

Despite many Native American victories, such as the Battle of Little Bighorn - better known as Custer's Last Stand -, the war ultimately ended in the tribes' displacement. The conflict officially finished with the Agreement of 1877, in which the Sioux tribes were forced to cede property rights of their lands to the federal government, while clearly demarcated Indian reservations were established.

8

Oklahoma Land Rush (1889)

Image: Raychel Sanner

On April 22, 1889 - soon after the signing into law of the Indian Appropriations Act, which freed over two million acres of land for settlement - thousands of settlers raced to claim land in the Oklahoma Territory during the first of several land rushes.

Those who followed the rules and waited for the official start of the land rush were known as "boomers," while "sooners" sneaked into the territory before the designated time, risking penalties but gaining advantageous claims. This sparked hundreds of legal contests that had to be settled at local land offices or even by the U.S. Department of the Interior.

9

The Dawes Act (1887)

Image: Boston Public Library

The Dawes Act aimed to assimilate Native Americans by dividing tribal lands into individual allotments. While intended to promote agriculture and integration, it resulted in the loss of tribal lands and culture.

The act was a controversial effort to reshape Native American society in the image of European-American settlers. It wasn’t until the Indian Reorganization Act, passed during the Franklin D. Roosevelt administration, that Native Americans regained some of their rights to own land collectively and form self-government.

10

Closing of the Frontier (1890)

Image: Aaron Burden

In 1890, the U.S. Census Bureau declared the frontier closed, as there was no longer a discernible frontier line. This marked the end of a significant era of American expansion.

The closing of the frontier signified the nation's transition from a period of exploration and settlement to one of modernization and industrialization.

1

Seattle Underground City

Did you know the remnants of Seattle's original streets are still accessible? Beneath the bustling streets of modern-day Seattle lies the Underground City , a network of subterranean passageways that formed the ground level in the 1800s.

By the end of the 19th century, after the Great Seattle Fire, it was decided to rebuild the city at a higher elevation to combat frequent flooding . So, these original streets, sidewalks, and storefronts were buried, and with it, much of their history.

Guided tours take people through tunnels and ladders and retell real and eerie stories about the history of the Underground City.

2

Luray Caverns

Image: Robert Thiemann

Have you ever heard of the underground Stalacpipe Organ ? Not only is it a one-of-a-kind interaction between keyboards and cavern stalactites, but it is also the largest musical instrument in the world, according to Guinness World Records.

This instrument lives in the Luray Caverns, Virginia. It consists of an electric console that taps on these ancient stalactites of varying sizes to produce musical tones. A subterranean wonder, these caverns are also known for their extraordinary size , housing towering stalactites and stalagmites, mirrored pools, and delicate drapery-like calcite formations.

3

The Underground Gardens of Baldassare Forestiere

Image: Adrian Botica

This stunning subterranean retreat was built entirely by hand. Tucked under the sun-scorched landscape of Fresno, California, lie the Underground Gardens of Baldassare Forestiere . They are the life’s work of Baldassare Forestiere, a Sicilian immigrant who started digging in the early 1900s to escape the Central Valley's oppressive heat.

Over 40 years, drawing inspiration from ancient Roman catacombs , Forestiere carved an elaborate network of underground rooms, passageways, grottoes, and courtyards that span 10 acres.

A unique masterpiece, the gardens are open with guided tours that lead guests through beautifully designed spaces featuring skylights, arches, and alcoves. This oasis also boasts an array of fruit trees, including citrus, figs, and olives.

4

Ruby Falls

Image: Goodfreephotos_com

Colorful and breathtaking, the Ruby Falls is a geological wonder located inside Lookout Mountain near Chattanooga, Tennessee.

Hidden over 1,000 feet below the mountain's surface, this waterfall cascades 145 feet into a pool , making it one of the tallest underground waterfalls open to the public.

Visitors enter the mountain and descend via elevator. Then, they walk through stunning cave formations such as stalactites, stalagmites, and flowstone. At the waterfall chamber, multicolored lights –powered by renewable energy– illuminate the falls. Lantern-lit tours are also offered as a chance to visit the marvel with a different charm.

5

The Catacombs of Green-Wood Cemetery

Image: Joy Ernst

Arched tunnels of tranquil, sacred vaults lie beneath the Green-Wood Cemetery in Brooklyn, New York. Built in the mid-19th century, these catacombs were designed as a prestigious resting place for the city’s elite , prominent families.

While the catacombs are typically closed to the public, special events are sometimes organized to welcome visitors, such as art expositions, guided history tours, and candlelit tours seasoned with live music and storytelling.

Outside, where the sun does reach, await the serene landscapes and remarkable monuments of the cemetery, which is itself a National Historic Landmark .

6

The Lost Sea

Image: Roberto Nickson

The largest underground lake in America is in Tennessee. Hidden within the Craighead Caverns in Sweetwater, this enormous body of water lies in a cave system filled with fascinating formations, such as stalactites, stalagmites, and rare anthodites, also known as "cave flowers."

A National Natural Landmark, this lake marvels scientists, who are yet unaware of the exact extension of its waters. Those who visit can embark on a boat ride called "The Lost Sea Adventure," first walking inside the cavern before reaching a boat to navigate these ethereal sights.

7

Mammoth Cave National Park

Image: Sherin Jacob

The Mammoth Cave National Park is home to the longest cave system in the world . Located in central Kentucky, it extends over 420 miles of explored passages and many more likely undiscovered. Enormous chambers, underground rivers, a labyrinth of tunnels, and gypsum crystal formations can all be found at this site.

The park has been declared a UNESCO World Heritage Site and an International Biosphere Reserve. It also includes over 52,000 acres of protected land on the surface, renowned for its lush forests and diverse wildlife.

8

Carlsbad Caverns National Park

Image: Cason Asher

A large bat colony lives in the Carlsbad Caverns National Park in New Mexico, but that’s not its only charm. The park boasts over 100 caves, with its centerpiece being the immense Carlsbad Cavern.

The cavern includes the Big Room, one of the largest underground chambers in North America, spanning 8.2 acres. Visitors can descend via an emblematic natural entrance or by elevator, dropping 750 feet underground. Stalactite formations like the Giant Dome, the Hall of the White Giant, and the Chandelier are some of the caves' breathtaking highlights.

9

Indian Echo Caverns

Image: Magda Ehlers

The Indian Echo Caverns, which have been open to the public since the early 1920s, are carved into the limestone of the Appalachian Mountains. Located near Hummelstown, Pennsylvania, this site gets its name from the echoes heard within the cavern’s chambers , which were once believed to be mystical by Native American people in the area.

Unique, immersive sections of the caverns have names like the "Crystal Palace," the "Echo Room," and the "Wedding Room," where, yes, real weddings are sometimes held!

10

Wind Cave National Park

Image: Francesco Ungaro

Wind Cave National Park, located in the Black Hills of South Dakota, is one of the world’s largest caves, but that’s not what it’s most famous for. One signature sight here is the boxwork formation , a rare lattice-like pattern formed by calcite deposits.

The cave system stretches for over 140 miles, though much of it remains unexplored. Popular tours take guests through captivating features like the "Ribbon Room" and the "Crystal Palace."

Why is Wind Cave called that? Mainly due to the "wind" phenomenon that occurs at its entrance. The cave's air pressure causes the entrance to draw in or expel air, depending on atmospheric conditions.

1

"New York, New York" - Frank Sinatra

Image: Adrian Falcon

Of course, when we think of songs about the Big Apple, the first that comes to mind is the iconic "New York, New York," popularized by Frank Sinatra. Perhaps this is because it’s the tune that best captures the essence , resilient spirit, and unwavering magnetism of the city that never sleeps.

It was written in 1977 by John Kander and Fred Ebb as the theme song for New York, New York , a film directed by Martin Scorsese and starring Robert De Niro and Liza Minnelli. Minnelli performed the song in the film, but it wasn’t very successful at the time. It was The Voice 's 1980 version that would turn it into the city's unofficial—yet unquestionable—anthem .

2

"Chelsea Hotel #2" - Leonard Cohen

Image: Thought Catalog

The Chelsea Hotel is one of the most emblematic hotels in New York City. Artists such as William S. Burroughs, Bob Dylan, and Chet Baker, among many others, have stayed there. So, it makes perfect sense that some of these stars were inspired by the iconic building to create some of their most famous works.

Such is the case with Leonard Cohen’s "Chelsea Hotel #2," released in 1974. The lyrics not only recount a romantic encounter between the singer-songwriter and Janis Joplin but also capture the city’s bohemian atmosphere at the time.

3

"New York State of Mind" - Billy Joel

Image: Stefano Zocca

In the mid-1970s, after a long stint in Los Angeles, Bronx-born songwriter Billy Joel was terribly missing his hometown. During a return trip to the Big Apple while on tour, the Piano Man wrote his tribute to the city he loved most: "New York State of Mind."

At the time, the song wasn’t even released as a single and went largely unnoticed. However, over time, it became one of Joel’s signature songs . Decades later, the timeless tune would go on to inspire a hip-hop version—the next one on our list.

4

"Empire State of Mind" - Jay-Z & Alicia Keys

Image: ian dooley

With its evocative lyrics, Jay-Z’s modern rhythm, and Alicia Keys’ poignant backing vocals, "Empire State of Mind" captures the essence, energy, and resilient spirit of those who inhabit the city of New York. Released in 2009, the song was an instant hit. It achieved commercial success worldwide and has been featured on multiple critics' top 10 lists of best songs.

As mentioned earlier, the song’s title nods not only to Billy Joel’s "New York State of Mind," but also to rapper Nas’s 1994 single "N.Y. State of Mind."

5

"Autumn in New York" - Billie Holiday

Image: Josh Couch

Did you know that the famous "Autumn in New York" was originally conceived as a poem rather than a song? Its composer, Vernon Duke, wrote it in 1934 while vacationing in Westport, Connecticut, and added the music sometime later. Since then, many artists have recorded their own renditions, including Frank Sinatra, who helped popularize it in 1949.

But perhaps the version that best conveys the haunting melancholy of this iconic jazz standard is Billie Holiday’s, recorded in 1952. With her deep, raspy voice, the Angel of Harlem (see the next song on our list) delivers this love letter to the Empire City like no one else.

6

"Angel of Harlem" - U2

Image: The New York Public Library

"Angel of Harlem," a 1988 single by the Irish band U2, alludes to several New York City landmarks but is also a heartfelt tribute to Billie Holiday.

According to Bono, the song was inspired by the band’s first trip to the Big Apple . When they landed at JFK Airport, a limousine picked them up, and the driver had the radio tuned to Lady Day’s voice. They were so captivated by her sound that they couldn’t help but compose a song in honor of one of the city’s most influential musical figures.

7

"Englishman in New York" – Sting

Image: George Bakos

Bono wasn’t the only foreign artist who was inspired by the Empire City to pen a song. In the late 1980s, Sting released the single "Englishman in New York" as part of his second solo album after the dissolution of The Police. The song quickly became a global hit.

The "Englishman" in question is Sting’s friend, British writer and LGBTQ+ icon Quentin Crisp, who had recently relocated to New York. The singer-songwriter said that the different musical references in the song seek to capture the mood of someone walking down the street and listening to different styles, representing what it's like to walk around New York.

8

"Chelsea Morning" - Joni Mitchell

Image: Dan Braga

One of the most celebrated voices in American folk music, Joni Mitchell, wrote this song about her apartment in New York City’s Chelsea neighborhood. The song was inspired by the colorful reflections that danced on her walls when sunlight filtered through a mobile made of colored glass she had found in the street.

"Chelsea Morning" is part of her second album Clouds from 1969. Her sweet voice, merry acoustic guitar chords, and hopeful lyrics convey the deep emotions of the hippie lifestyle of a young woman living in 1960s New York.

9

"The Only Living Boy in New York" – Simon & Garfunkel

Image: Camila Fernández

Many songs about New York City explore the loneliness of living in a vast metropolis—and "The Only Living Boy in New York" is no exception. Paul Simon wrote the track when his musical partner, Art Garfunkel, left him behind in the city to film a movie in Mexico.

The song is part of the duo's fifth studio album, Bridge over Troubled Water released in 1970. The song blends bittersweet lyrics with a gentle, introspective melody. Its themes of solitude and longing have resonated with many over the years, inspiring a variety of heartfelt covers by artists who connected with its quiet sorrow.

10

"New York City Serenade" – Bruce Springsteen

Image: Danny Lyon, Public domain, via Wikimedia Commons

While Bruce Springsteen is known for being a New Jersey native, his prolific career also allowed him to write about the city across the Hudson River. "New York City Serenade" is part of the 1973 album The Wild, the Innocent & the E Street Shuffle , considered by some critics to be one of the greatest albums in rock n' roll history.

The song tells the tormented love story of Billy and Diamonds Jackie as they wander the dark streets of Gotham in the 1970s. Blending Springsteen’s signature suburban rock with elements of jazz and gospel , "New York City Serenade" is one of his most atmospheric and musically ambitious pieces—a sprawling homage to the city’s grit, soul, and romance.

11

"Rhapsody in Blue" – George Gershwin

Image: rosanna17

Although it has no lyrics, we can all agree that this composition is a true musical portrait of 20th-century New York City. Written by George Gershwin in 1924, the piece blends classical tradition with jazz-inflected flourishes, capturing the vibrant, chaotic spirit of the Big Apple in full swing.

The speed and rhythm of the tune perfectly reflect the frenetic life of one of the world's greatest metropolises. "Rhapsody in Blue" is so quintessentially New York that even Woody Allen used it for the opening sequence of his film Manhattan alongside gorgeous vistas of the most iconic locations and buildings in the city.

12

"Downtown Train" – Tom Waits

Image: Erik Calonius, Public domain, via Wikimedia Commons

You may know this song best from Rod Stewart’s 1989 hit version, but "Downtown Train" was originally written and performed by Tom Waits for his 1985 album Rain Dogs . Without leaving behind his jazz and blues influences —and his trademark avant-garde style—this tune has an unmistakable pop touch.

Set against the backdrop of New York’s restless nightlife, the song paints a wistful portrait of longing and unattainable love—particularly for the elusive Brooklyn girls. Through his gravelly voice and poetic imagery, Waits cements his place as one of the great modern chroniclers of the Big Apple .