1

Grand Prismatic Spring

Image: MikeGoad

The steaming, multicolored circle of the Grand Prismatic Spring is one of the most hypnotic and unique sights in the U.S. Part of Yellowstone National Park, this hot spring is the largest in the country and the third-largest in the world, measuring 370 feet wide and 160 feet deep.

Its vibrant colors, ranging from deep blue in the center to fiery red and orange at its edges, are unlike anything we see in nature every day. Minerals and microbes are responsible for these hues, with water temperature causing the pigments to fluctuate . The spring owes its existence to geothermal activity driven by Yellowstone's underlying magma chamber and is located in the Midway Geyser Basin.

2

Fly Ranch Geyser

Image: Ken Lund, CC BY-SA 2.0

One of the reasons why Fly Ranch Geyser is unique in the world is that it was formed after a human accident . This technicolor geothermal geyser, located on the Fly Ranch property in the Hualapai Geothermal Flats of Washoe County, Nevada, wasn’t there before 1916.

In 1916, while drilling a well for irrigation in the area, workers struck near-boiling geothermal water, leading to the creation of the first geyser. Decades later, in 1964, a geothermal energy company drilled a second well nearby, which caused the emergence of the Fly Geyser we know today. It has been spouting water into the sky ever since, forming several cone-like vents atop a mound that continues to grow.

3

Devil’s Kettle

Image: chrishawaii

Where does the water from the Brule River go when it falls? For a long time, this was a mystery. Located in Judge C.R. Magney State Park near Grand Marais, Minnesota, along the North Shore of Lake Superior, the river is famous for its unusual split: one half flows downstream, while the other plunges into a seemingly bottomless hole .

This waterfall has baffled visitors and scientists for years because objects thrown into the "kettle," such as logs and ping-pong balls, appeared to vanish without resurfacing. This fueled theories of underground rivers or deep caverns beneath the falls. The mystery was solved recently when hydrologists discovered that the water entering the kettle resurfaces downstream . The kettle's strong currents explain why objects thrown in don’t resurface; they are broken apart and held underwater, functioning like a natural washing machine.

4

Mono Lake Tufa Towers

Image: Stephen Leonardi

These unique limestone formations, known as the Mono Lake Tufa Towers, emerge from the salty, alkaline waters of Mono Lake , fed by underwater springs. Located in eastern California, near the Sierra Nevada mountains and about 13 miles east of Yosemite National Park, they are a striking natural wonder.

These tufa towers rise dramatically from the water. How were they formed? Mono Lake has no outlet, so its high alkalinity and salinity caused minerals to accumulate over time. This unique environment supports an ecosystem of brine shrimp, alkali flies, and migratory birds. To give you an idea, the lake’s salinity is more than twice that of the ocean, which means you could float effortlessly in its waters, as many visitors do.

5

Crater of Diamonds

Image: Brett Sayles

If you find a diamond here, you get to keep it—this is the only diamond-bearing site in the world where that's possible. Open to the public for mining , the Crater of Diamonds is a 37.5-acre field located near Murfreesboro, Arkansas. It marks the eroded surface of a volcanic pipe composed of lamproite, a rare volcanic rock.

Visitors sometimes find diamonds of various colors, including white, yellow, and brown, along with other gems like amethyst and garnet. It was here that the "Uncle Sam Diamond" was found, the largest diamond ever dug out in North America, weighing 40.23 carats. Diamonds were first discovered here in 1906 when a local farmer found unusual crystals on his land, which sparked a minor diamond rush.

6

Antelope Canyon

Image: Roberto Lee Cortes

Rocks that look like flowing water: Antelope Canyon is a famous and breathtaking slot canyon in northern Arizona. It consists of two main sections: Upper Antelope Canyon (a.k.a. Tsé bighánílíní, or "the place where water runs through rocks") and Lower Antelope Canyon ( Hazdistazí, or "spiral rock arches").

The canyon was formed over millions of years as flash floods and desert winds eroded the Navajo Sandstone. Even today, seasonal flash flooding continues to shape and carve the canyon’s mesmerizing features. Its surreal, wave-like formations in shades of orange are a favorite subject for photographers and tourists from all over the world.

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Petrified Forest

Image: Megan Clark

The Petrified Forest National Park in northeastern Arizona boasts one of the world's largest and most vibrant concentrations of petrified wood . The park, part of the Painted Desert, is located between the Apache and Navajo Counties.

Most of the wood found there is from ancient conifer trees that date back about 225 million years to the Late Triassic period. These trees were swept into river systems, buried by sediment, and transformed into stone through a process called permineralization . The park also features a wealth of fossilized remains of ancient animals, including early reptiles.

8

Devils Tower

Image: Kyle Petzer

The Devils Tower stands alone, protruding dramatically from the plains. Considered sacred by Native American tribes, it was originally called "bad god’s tower," a name that eventually evolved into its current form. Located in northeastern Wyoming, this igneous rock monolith soars 867 feet above its base.

It was designated the first U.S. National Monument by President Theodore Roosevelt in 1906. Geologists agree that Devils Tower was formed through the intrusion of magma into sedimentary rock layers about 50 to 60 million years ago. Today, climbers from around the world are drawn to its sheer walls, though climbing is prohibited in June to honor Native ceremonies.

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The Wave

Image: Mark Nemenzo

The Wave is a visually stunning sandstone formation located in the Coyote Buttes North area of the Vermilion Cliffs National Monument. Known for its hypnotic, swirling bands of red, orange, and yellow, its delicate ridges are so easily damaged that even one misplaced footstep could ruin the beautiful patterns.

Approximately 185 million years ago, this area was a vast desert covered in dunes. Over time, layers of sand were deposited, compacted, and cemented, forming this Navajo sandstone shape. Unfortunately, The Wave is only accessible by a challenging hike that requires a permit, due to the fragility of its ecosystem and high demand from visitors. With less than 5% of applicants obtaining a permit each year, it is one of the most exclusive hiking destinations in the world.

10

Kasha-Katuwe Tent Rocks National Monument

Image: Bruce Warrington

The Kasha-Katuwe Tent Rocks National Monument, located in northern New Mexico, displays a unique landscape of tall, cone-shaped rock formations. These "tent rocks," composed of pumice and tuff, are known as "hoodoos." They are natural formations ranging from a few feet to approximately 90 feet tall.

The name "Kasha-Katuwe" means "white cliffs" in the Keresan language of the Cochiti Pueblo. Hiking trails, such as the Slot Canyon Trail, offer visitors the opportunity to explore the cones up close while walking through dramatic, narrow canyons.

1

Alaska SeaLife Center - Seward, Alaska

Image: David Clode

Alaska truly is the last frontier. Its wildlife is as vast as its land, and its sealife is equally incredible. To get a closer look at many of these creatures, the Alaska SeaLife Center in Seward offers an excellent opportunity.

The only public aquarium in the state, the center combines regional exhibits with marine research, education, and wildlife rehabilitation. At this unique facility, visitors can observe regional birds in the aviary, view an undersea kelp forest, or watch seals and Steller sea lions at play in the Rocky Coast exhibit.

2

National Aquarium - Baltimore

Image: naomi tamar

The National Aquarium in Baltimore is home to a wide range of exhibits, from an Amazon River forest to an Atlantic coral reef and more. Visitors can encounter an incredible array of creatures , enjoy interactive experiences , watch 4D films , and even participate in aquarium sleepovers .

Aside from its exhibitions, the National Aquarium's conservation work is geared toward combating climate change, protecting wildlife and their habitats, and reducing plastic pollution. Recent visitors have also raved about the dolphin show.

3

Shedd Aquarium - Chicago

Image: Caroline Hernandez

The Shedd Aquarium in Chicago gives visitors an up-close view of a variety of aquatic animals, including jellyfish, seahorses, and giant Pacific octopuses. The aquarium offers animal encounter experiences with beluga whales, sharks, penguins, stingrays, and sea otters.

There are also plenty of exhibits to explore. Pacific white-sided dolphins, belugas, California sea lions, and sea otters can be observed from both underwater and above-water viewing areas. The Polar Play Zone allows children to learn about life at the North and South poles in a kid-sized submarine, feeling the texture of a starfish in the touch pool, and admiring the underwater viewing area.

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Tennessee Aquarium - Chattanooga, Tennessee

Image: Shane Rounce

The Tennessee Aquarium is divided into two separate buildings for freshwater and ocean exhibits , showcasing thousands of animals, including the macaroni penguin, sand tiger shark, alligator snapping turtle, hellbender, and giant Japanese spider crab.

The River Journey building features the Turtles of the World gallery, an Appalachian cove forest habitat, the River Giants exhibit, and more. In Ocean Journey , visitors will find a butterfly garden, a tropical cove habitat, and the Boneless Beauties exhibit, among other highlights.

5

Seattle Aquarium - Seattle

Image: Craig Lovelidge

Aquatic life in Puget Sound can be witnessed through the Seattle Aquarium's one-of-a-kind, 360-degree Underwater Dome , which displays local fish in a 400,000-gallon habitat . Set on two historic piers, the aquarium educates visitors about Puget Sound and the ocean at large through exhibits, events, conservation and education programs, research activities, and more.

At the Family Activity Center, guests of all ages can participate in hands-on activities to learn about the majestic orcas of the Pacific Northwest. The aquarium's species recovery program works to save animals from extinction through research, field conservation, and more.

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Aquarium of the Pacific - Long Beach, California

Image: Julien Maculan

The Aquarium of the Pacific, in Long Beach, California, features habitats from the tropical Pacific Ocean, northern Pacific waters, and the Southern California/Baja region. As Southern California's largest aquarium, it houses more than 12,000 animals across 100-plus exhibits highlighting aquatic life in the Pacific Ocean.

The state-of-the-art Pacific Visions wing offers guests an interactive experience through film, art, and technology. Visitors can see what it's like to be an aquatic vet at the Molina Animal Care Center, and then learn about water sources and conservation at the Our Water Future exhibit.

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New England Aquarium - Boston

Image: David Clode

The New England Aquarium features an open-air exhibit space for seal and sea lion training, the four-story Giant Ocean Tank, an Indo-Pacific coral reef habitat, an exhibit spotlighting Atlantic harbor seals , and the Simons Theatre with its nearly five-story-tall movie screen.

Aside from the indoor and outdoor exhibits, the aquarium's research division conducts ocean exploration and conservation through a plethora of initiatives like saving sea turtles and protecting North Atlantic right whales.

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Shark Reef Aquarium - Las Vegas

Image: SGR

An aquarium is probably not the first thing that comes to one’s mind when thinking about Las Vegas, but the Shark Reef Aquarium is well worth a visit. With more than 2,000 animals, it features jellyfish, sharks, sea turtles, and even crocodiles.

Guests can feed stingrays, sea turtles, or even a zebra shark, or try out the Undersea Explorer VR Theater for an immersive digital experience.

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Aquarium of Niagara - Niagara Falls, New York

Image: Shaun Low

Visitors can find more than 120 animal species at the Aquarium of Niagara, including many rescues that are unable to survive in the wild. The Penguin Coast exhibit is home to a colony of 14 Humboldt penguins , and the aquarium showcases over 100 species of fish and invertebrates from both freshwater and saltwater ecosystems , as well as several species of seals and sea lions .

In the summer of 2024, the aquarium unveiled the Great Lakes 360 experience with an interactive sturgeon touch pool and 16 new exhibits highlighting animals from the Great Lakes and Niagara River ecosystems.

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Georgia Aquarium - Atlanta

Image: David Clode

At the enormous Georgia Aquarium, visitors can get close to rays, dolphins, sea lions, penguins, and sea otters, or even go behind the scenes at a dolphin training session. The aquarium focuses on conservation education and fostering positive connections between humans and animals.

The Ocean Voyager exhibit features a 100-foot-long underwater walk-through tunnel that displays more than 50 species.

1

Massachusetts

Image: Kaya Arro

A curious word in itself, Massachusetts originated from an Algonquian word meaning "large hill place." The term "Massachusett" was first recorded in 1616 as the name of a village near present-day Boston, and the English added an -s to signify the plural.

The name was applied to the bay, from which the Massachusetts Bay Company, founded in 1629, took its name. With the Massachusetts Constitution of 1780, legislators officially adopted the name Commonwealth of Massachusetts.

2

Michigan

Image: Aaron Burden

Another name with an Algonquian origin, like Massachusetts, Michigan comes from the word mishigama which means "big lake." The state was named after its chief geological feature: that large body of water to its west. After all, Michigan is in direct contact with four of the five Great Lakes.

When the area became a U.S. territory, the name Michigan was adopted as the name of the state. Michigan achieved statehood in 1837.

3

Montana

Image: Tim Stief

A name most likely derived from the either Spanish ( Montaña ) or Latin ( Montanus ) word for mountain, Montana was suggested by Rep. James M. Ashley of Ohio, who was a member of the House Committee on Territories. He recommended it in 1863 for the territory that would become Idaho. He liked the name so much that he recommended it again for a territory being organized in 1864.

The name Montana itself was first given in 1858 to a town in the Pike’s Peak gold region, which was at the time part of Kansas and is today part of Colorado. The town eventually died, though, when the gold ran out, but the name lived on.

4

Oklahoma

Image: Skyler Smith

The name Oklahoma was coined in 1866 by Allen Wright, a Choctaw chief and Presbyterian minister who served in the Confederate Army during the Civil War. He combined two Choctaw words that, together, mean "Land of the Red People." Eventually, the name was adopted into the Choctaw-Chickasaw Treaty.

5

Pennsylvania

Image: Lera Kogan

In 1681, the English king Charles II gave a land grant to William Penn. The charter designated that the colony was to be called Pennsylvania, which was a combination of Penn’s name and the Latin " silva " (spelled " sylva " in the 17th century), meaning "forest." Therefore, Pennsylvania means " Penn’s forest ."

William Penn had originally suggested that the land be called New Wales, but since the charter was signed with Pennsylvania permanently inscribed, he declared that the name was in honor of his father.

6

Tennessee

Image: Brice Cooper

While the names of many states originate from descriptions, the name of Tennessee didn’t have any particular meaning when it was bestowed upon the Volunteer State. This name originally came from a Cherokee town called Tanasqui by the Spanish, and Tinnase by the English. But the Cherokees themselves didn’t associate any literal meaning with the word.

The name was also given to a stream near the town, and as English settlers moved downstream, they carried the name with them. Tennessee first appeared in that spelling as the name of a newly organized county in North Carolina in 1788, and it was eventually proposed and accepted by Congress as a state name in 1796.

7

Wyoming

Image: Kellie Klumb

The name of Wyoming originated from the Algonquian word meche-weami-ing , which meant " at the big flats. " It was originally applied to a valley in Pennsylvania and became well-known through Thomas Campbell’s epic 1809 poem "Gertrude of Wyoming," which was about a girl from Pennsylvania.

James Ashley, a member of the House Committee on Territories representing Ohio, suggested the name for a new territory in 1868.

8

Alaska

Image: Rod Long

The name Alaska is thought to come from the Aleut word aláxsxaq or aleyska , which translates to " an object to which the sea is directed ."

When Alaska was purchased from Russia in 1867, the name Alaska was suggested by Senator Charles Sumner under the belief that it meant "great land," when in fact the word was simply what Aleuts used to refer to the mainland.

9

Connecticut

Image: Christopher Luther

Whoever thinks Connecticut sounds like a complicated word, should take a look at the Algonquian word from which it originated: Quinnehtukqut , which means " place beside the long tidal river. "

An English scribe probably inserted the second, silent "c" in the name into the word to form the more common "connect" section, as we know it today.

10

Idaho

Image: Clay Elliot

The name of the state of Idaho has at least two probable origins. On the one hand, it may be derived from the word Idahi , the Kiowa-Apache name for the Comanche, both of whom were known to have been in that area. On the other hand, it might have been fabricated by a mining lobbyist at a time when native-sounding names were popular.

When Colorado was being organized as a territory in 1860, the name Idaho was considered, but Congress chose Colorado instead. The name came up again in 1863 when territories farther north were being organized. Montana was first proposed for the new area, but the U.S. Senate decided to call it Idaho.