1

Thor's Well, Oregon

Image: Eric Muhr

Imagine there is a huge, circular hole in the sea where water seems to fall endlessly into an abyss. Spooky, right? Well, this is what you'll see if you look at the incredible Thor's Well, located on the Oregon coast.

Despite its name, it's not a well but a large, bowl-shaped sinkhole situated on the rocky shore. When you see it, it gives the impression that the ocean is being drained away! The ocean waves flow in and out of the hole, creating a dancing water spectacle. But that's not all; the site is surrounded by rugged volcanic rock that becomes slippery and hazardous when wet. It feels almost like stepping into a scene from a fantasy movie.

2

Devil's Den, Florida

Image: Michael Behrens

When it comes to spooky names, Devil's Den stands out. While its name might not sound very inviting—unless you’re a horror fan—this is actually an incredibly beautiful place with a charm that is hard to match.

Devil's Den is a prehistoric underground spring and cave system. Picture yourself walking through the state of Florida when suddenly you find a big, mysterious hole in the ground. When you look down, you discover a cave with a bright blue body of water inside. Scientists believe that the roof of an underground river collapsed here, exposing the water surface and creating what we now know as Devil's Den Spring.

If you haven't visited this spot yet, this is your invitation; you won't regret it!

3

Bisti/De-Na-Zin Wilderness, New Mexico

Image: John Fowler

Bisti/De-Na-Zin Wilderness is an incredible landscape filled with reddish-purple rock formations on eroded terrain . The site has amazing geological structures sculpted from sedimentary rock.

While this scene looks like something out of a science fiction movie set on some distant planet, this extraordinary place is not only on Earth but also right here in northwestern New Mexico.

Want to know what its name means? Bisti and De-Na-Zin are Navajo words that can be translated to "a large area of shale hills" and "standing rock," respectively.

4

Bumpass Hell, California

Image: Quentin Burgess

Lassen Volcanic National Park in northeastern California has something to surprise visitors: a geothermal basin.

We're talking about Bumpass Hell, a place with a name that has an interesting history. This spot owes its name to Kern Bumpass, a miner who, in the 19th century, was one of the first to explore this little-known wonder. Bumpass suffered injuries and burns due to the geothermal activity, which gave rise to the ingenious name that the area has today.

What you see upon arrival is a series of steam vents reaching temperatures of up to 200°F , rising from bubbling hot springs. And as if all this weren't enough, Bumpass Hell is framed by the beautiful Cascade Mountains.

5

Havasu Falls, Arizona

Image: Cara Fuller

While the Grand Canyon in northern Arizona is one of our country's best-known natural landmarks, it also holds a special spot that many overlook. Although a permit is required and access is a bit tricky, the effort is well worth it to find the beautiful Havasu Falls. The most common way to reach Havasu Falls is by hiking , but you can also get there by helicopter.

The waterfall is an impressive 100 feet high and splashes against the unique rocky backdrop. This spot is mesmerizing, and this fact is reflected in its name: Havasu translates to "blue-green water" in the Havasupai language.

6

Turnip Rock, Michigan

Image: Cody Doherty

The Great Lakes are well-known for their beauty and size, but there's a hidden gem among them that has been overlooked for a long time.

Picture yourself standing on the shore of a lake and suddenly spotting a large rock formation that appears to be balancing on the water. If you experience this, you're probably in the state of Michigan, precisely standing by Lake Huron, witnessing the incredible formation called Turnip Rock.

Its name comes from its strange shape: over the years, the action of the waves has eroded the base of the rock, making it narrow while leaving the top wide. As a result, the rock now resembles a giant turnip. The best way to reach this site is by kayak, so if you like that activity, Michigan is the perfect place for you!

7

Apostle Islands Sea Caves, Wisconsin

Image: Spencer Fitzgerald

Wisconsin boasts some of the most beautiful natural areas and holds unexpected scenery.

If you enjoy museums and art, don't miss Apostle Islands Sea Caves in Wisconsin. Here, nature is the main work of art, with water as the star sculptor!

In this spot, the water has drastically affected the cliffs, carving out wonderful rock formations with incredible shapes. However, all of this becomes even more amazing in winter when the site is covered with ice water and adorned with icicles hanging like spikes!

8

Craters of the Moon National Monument, Idaho

Image: Chris Bair

If you are someone who has always dreamed of traveling to space and stepping foot on the moon , this place might become your new favorite spot.

While it's not actually in outer space, Craters of the Moon National Monument in Idaho makes you feel as if you were there. As the name suggests, the landscape here resembles lunar craters. These pits and fissures in the dark, hardened ground are the result of volcanic activity that has occurred in the area over the past 15,000 years.

If you enjoy hiking, exploring caves, and taking in spectacular views, don’t miss the chance to visit this remarkable place!

9

Lost River Cave, Kentucky

Image: Bruno van der Kraan

As if descending into the dark depths of a cave weren’t enough, imagine the sensation of navigating an underground river! If you're not afraid of that scenario, then you can visit Lost River Cave in Kentucky.

After passing through a dramatic entrance, you'll enter the cave system, a mysterious world adorned with stalactites and stalagmites that decorate the entire space. But the highlight is the river flowing through it. Visitors can experience this adventure by taking a boat ride along the underground river with other guests. It’s an experience you definitely won't want to miss!

10

Providence Canyon, Georgia

Image: Shelby Cohron

Yes, the Grand Canyon is absolutely impressive and beautiful, but it's not the only canyon in our country. Right here in the US, we also have the Providence Canyon, located in southwestern Georgia.

Sometimes called "Georgia's Grand Canyon," this stunning place is approximately 120 miles southwest of Atlanta and covers about 1,000 acres. The rock formations here delight visitors with a varied color palette, ranging from pink to red, orange, and even purple.

In addition, the canyon's depth ranges from 15 to 50 feet, offering magnificent views to enjoy during the hike. If you love to explore, make sure to visit Georgia!

1

Hawaii (1,052 miles)

Image: Karsten Winegeart

Over 1,052 miles of volcanic islands, a unique blend of black sand beaches, lush rainforests, and vibrant coral reefs await.

Snorkel with sea turtles in Hanauma Bay on Oahu, or learn to surf on the legendary waves of Waikiki Beach. You could also visit the dramatic cliffs of Kauai, featured in film sagas like Jurassic Park and Pirates of the Caribbean.

2

Oregon (1,410 miles)

Image: Dave Hoefler

You might remember seeing Haystack Rock featured in the film The Goonies , or glimpses of the charming town of Astoria , where the classic Free Willy was filmed.

These are just two of the many jewels of Oregon's Pacific coastline. Dramatic sea stacks, hidden coves, and beautiful towns like Cannon Beach also await.

3

New York (2,625 miles)

Image: Tommy Kwak

New York's coastline offers a mix of bustling beaches, charming towns, and iconic landmarks. There’s the famous Coney Island boardwalk , as well as the historic lighthouses and sandy shores of Long Island.

If you’ve seen the romantic drama Eternal Sunshine of the Spotless Mind , surely you’ve felt curious about visiting the remote, nostalgic beaches of Montauk.

4

Washington (3,026 miles)

Image: Jennifer Arlem Molina

Rugged beaches, dramatic cliffs, and waterfront cities line the 3,026 miles of Washington's coastline. You can visit Pike Place Market in Seattle, or take a ferry to the Olympic Peninsula to hike through rainforests and explore tide pools.

The Washington State Ferries system can also take you to the San Juan Islands archipelago, famous for its forest waterfalls and whale-watching tours.

5

Virginia (3,315 miles)

Image: Steve Adams

Virginia ranks among the 10 states with the longest coastlines. Its sandy beaches and wide shores are also home to many historical landmarks .

You can explore Colonial Williamsburg, the Virginia Beach Boardwalk, as well as Mount Vernon by the Potomac River.

6

Texas (3,359 miles)

Image: Thomas Park

On Texas's Gulf Coast, you'll find Padre Island, the longest barrier island in the world , with pristine beaches and a haven for wildlife. There’s also Galveston Island, which blends history and entertainment with its Victorian architecture, museums, and family-friendly attractions like Moody Gardens.

7

North Carolina (3,375 miles)

Image: Joe Dudeck

The iconic Cape Hatteras Lighthouse is just one of the stunning views along North Carolina's Outer Banks. This state is famous for its Outer Banks , a chain of barrier islands with windswept beaches.

A notable attraction is the shipwreck-littered Graveyard of the Atlantic, a stretch of treacherous waters that fascinates many and features its own museum. And we can’t forget the historic Kitty Hawk, where the Wright brothers made their first flight.

8

Michigan (3,288 miles)

Image: John Schaidler

With over 3,000 miles of Great Lakes coastline, Michigan offers some of the most diverse shoreline experiences in the US.

You can explore the Sleeping Bear Dunes National Lakeshore along Lake Michigan, or step back in time on Mackinac Island, known for its Victorian charm and car-free roads . Another gem is the Pictured Rocks National Lakeshore on Lake Superior, with its dramatic cliffs.

9

Maine (3,478 miles)

Image: Rachel C

Maine's rugged coastline is a haven for outdoor enthusiasts, featuring cliffs, picturesque fishing villages, and abundant wildlife.

If you love animals in their natural habitat, you can visit seals and puffins in Bar Harbour. If you like hiking to stunning views, you can visit Acadia National Park and make it to the top of Cadillac Mountain .

10

California (3,427 miles)

Image: Meriç Dağlı

The Golden Coast must be included, of course! California's iconic coastline is a dream for beach lovers. Surfers can catch waves in Huntington Beach, a.k.a. "Surf City USA."

Other must-see spots include the Golden Gate Recreation Area, San Diego’s La Jolla, and, of course, Santa Monica’s colorful and bustling pier and boardwalk .

11

Louisiana (7,721 miles)

Image: Brent Woods

Louisiana's bayous and wetlands make its coastline unique. The Mississippi River Delta is an ecological treasure, home to abundant birdlife and fisheries, while the Atchafalaya Basin boasts the largest wetland and swamp in the US.

Of course, New Orleans is the cultural heart of this state, where jazz, gumbo, and beignets summon tourists from all over the world.

12

Florida (8,436 miles)

Image: Lance Asper

Florida! Sun-kissed beaches year-round and magnetic turquoise waters make this state’s coastline one of the most visited in the country.

The Florida Keys offer coral reefs perfect for diving, especially in John Pennekamp Coral Reef State Park. One should explore Miami Beach’s Art Deco District, the Everglades that spill into Florida Bay, and of course, the dreamy sights along Key West.

13

Alaska (33,904 miles)

Image: jesse orrico

Finally, with over 33,904 miles of coastline, there’s Alaska—a treasure trove of natural wonders like the ice formations of Glacier Bay National Park and the playful otters of Kenai Fjords National Park.

In Juneau, the state capital, you can witness humpback whales breaching in Auke Bay. So, if you don’t mind the cold or the long journey, you might want to visit and experience the breathtaking scenery!

1

What are bills made of?

Unlike other currencies, dollar bills are not made of paper or plastic. U.S. dollar bills are made from a special fabric blend composed of 75% cotton and 25% linen. This mix makes the bills extremely durable and resistant, and they can be folded about 4000 times before tearing.

2

What bills are valid?

Any U.S. dollar bill that was legally printed is valid, no matter how old, as American currency does not have an expiration date. While some bills might not be accepted by businesses of foreign exchange services due to their condition or if they are a discontinued version of the bill, the bills themselves are still valid, and American banks will accept them, though they might take them out of circulation.

3

American leaders

Five bills have a depiction of an American president. The exceptions are the $10 bill, with Alexander Hamilton on the front, and the $100 bill, with Benjamin Franklin. The $1 bill, depicting George Washington, is extremely symbolic: several elements are repeated 13 times as a nod to the thirteen colonies, and it showcases the Bald Eagle and the Eye of Providence as a sign of God watching over America.

4

A change in size

Did you know that dollar bills used to be so big that they were nicknamed "horse blankets"? Original dollar bills were 7.4 × 3.1 inches. In 1929, the Treasury Department reduced the size of bills to 6.14 × 2.61 inches to reduce production costs and materials. Old bills, though still valid, are worth much more as collector items.

5

Uniformity

Besides their value and design, all dollar bills have the same size (6.14 × 2.61 inches), color, and weight (1 gram) , which sets American currency apart from other countries where bills of different values are differentiated by size, color, or both. Why doesn’t the U.S. implement differences among bills? The cost of adapting vending machines, bank drawers, and ATMs to new bill sizes would cost billions of dollars.

6

Hard to copy

Originally, dollars were not green, but black. As time passed, green ink was favored, as it was cheap and did not fade as much as black. The new color also prevented people from using black-and-white cameras to create counterfeit money. Currently, dollar bills are predominantly green, but newer versions also include extra colors, such as pink, orange, or purple.

7

A $100,000 bill?

Have you ever seen a $500 or 1,000 dollar bill? What about a $100,000? Up until 1945, the U.S. Treasury printed $500, $1,000, $5,000, $10,000, and $100,000 notes , in addition to the values currently in use. These higher-value notes were mainly intended for bank and government use, but were sought by criminals as they made it easier to hide large amounts of money. Even though they were officially discontinued in 1969, these notes are still valid, though rare, and they have a high worth as collector's items.

8

No numbers

Unlike bills, American coins have different sizes and colors related to their value. Originally, gold, silver, and copper were used for coins, but modern coins are made of copper, zinc, or nickel. Besides their size and design, the value of each coin is printed in letters, not in numbers , alongside depictions of American presidents.

9

Liberty for all (the coins)

By law, all American coins must include six specific details : the word ‘Liberty’, the name of our country, the national motto "In God We Trust", the oldest American motto "E Pluribus Unum", the value of the coin, and the year. Each coin also includes a mint mark that shows where it was made: "P" for Philadelphia, "D" for Denver, "S" for San Francisco, and "W" for West Point.

10

A global currency

The American dollar is one of the most powerful currencies in the world, acting as a backbone for international trade and finances. It is estimated that two-thirds of the physical dollars in circulation are outside American territory. Besides the U.S. and its territories, eight sovereign nations have the U.S. dollar as their official currency, with several more accepting it as legal tender.