1

Great Basin National Park, Nevada

Image: Yura Lytkin

Tucked away in eastern Nevada, Great Basin is the park that time forgot—in the best way possible. You can hike to a glacier, explore underground caverns, and camp under skies so dark you’ll see stars you didn’t even know existed , all without waiting in line or fighting for a decent photo spot.

2

Congaree National Park, South Carolina

Image: Selma Rizvić

This park protects one of the largest remaining expanses of old-growth bottomland hardwood forest in the United States, which is a fancy way of saying it's got trees so tall and old they make you feel like an ant at a giant's picnic. The real magic happens at night, when the fireflies put on a light show that'll make you forget all about mosquito bites. Plus, you can rent a canoe and paddle through what feels like the set of a Southern Gothic novel—Spanish moss and all.

3

North Cascades National Park, Washington

Image: Pete Alexopoulos

With jagged mountain peaks and more than 300 glaciers, this park offers scenery that’ll make your camera work overtime . The hiking ranges from "pleasant afternoon stroll" to "why did I think this was a good idea?" so there's something for everyone, assuming everyone likes being surrounded by absurdly gorgeous wilderness.

The best part? While everyone's fighting over hotel rooms near Mount Rainier, North Cascades sits there looking spectacular with hardly anyone around. The park sees fewer visitors in an entire year than Yellowstone does on a busy weekend.

4

Dry Tortugas National Park, Florida

Image: Nick Rickert

Located 70 miles off the coast of Key West, Dry Tortugas takes "off the beaten path" to a whole new level: you literally need a boat or seaplane to get there. The turquoise waters are so clear you could see fish judging your swimming technique from 30 feet away . Plus, there's Fort Jefferson, a massive 19th-century fort that feels like someone plopped a Civil War–era fortress in the middle of paradise and said, "Sure, that works."

Just remember: there’s no fresh water (hence the "Dry" part), no food service, and no shade except what you bring yourself. It’s like camping, but surrounded by the kind of blue water that makes you understand why people write songs about the ocean.

5

Guadalupe Mountains National Park, Texas

Image: Ryuta F.

Home to the highest peak in Texas (Guadalupe Peak at 8,749 feet), this park offers hiking that'll remind your knees they're not as young as they used to be, but in a rewarding way. The fall foliage in McKittrick Canyon is legitimately stunning , which surprises people who assume Texas is all tumbleweeds and barbecue joints.

The park sits on an ancient fossil reef from when this whole area was underwater, mind-blowing, if you think about it for more than two seconds. There’s no cell service, limited facilities, and the nearest town is about an hour away, which may sound like a complaint, but it actually forces you to unplug and take in the amazing place around you.

6

Voyageurs National Park, Minnesota

Image: Vyacheslav Makushin

Voyageurs is a water-based park that’s basically a summer camp for adults who can legally drink beer. With over 200,000 acres—about 40% of it water—houseboating is the way to experience it.

The fishing here is legendary, the northern lights make regular appearances, and in winter, the frozen lakes become highways for snowmobiles and cross-country skiers . It's remote enough that you feel like an explorer, but accessible enough that you won't actually die if you forget your matches.

7

Black Canyon of the Gunnison National Park, Colorado

Image: Dustin Weist

Colorado has so many stunning places that Black Canyon somehow gets overlooked. This canyon is deep, narrow, and so dramatically steep that parts of it only get 33 minutes of sunlight a day . The Gunnison River carved through 2 billion years of rock to create towering walls that make you feel appropriately insignificant, which is good for the soul occasionally.

8

Isle Royale National Park, Michigan

Image: Ivan Vashchenko

If you want to really get away from it all, Isle Royale is your jam: an island in Lake Superior that requires either a ferry ride or a seaplane to reach. Once you’re there, you’re committed; same-day visits aren’t really a thing. The park is car-free, crowd-free, and home to a fascinating wolf-and-moose study that’s been running since 1958.

The hiking trails crisscross the island through forests and along rocky shorelines where the lake looks more like an ocean . Backcountry camping is the main event here, and the solitude is so profound you'll hear sounds you forgot existed—like actual silence.

9

Pinnacles National Park, California

Image: Cyrus Crossan

California's newest national park is a playground of volcanic spires, talus caves, and rock formations that look like a giant was playing with clay and just walked away mid-project . The rock climbing here is world-class, and the cave exploration doesn't require any special gear—just a flashlight and a willingness to squeeze through some tight spaces.

The spring wildflower displays are spectacular, and the park is one of the best places to see the endangered California condor, which has a wingspan that makes eagles look modest. It gets hot in summer—and by hot, I mean "surface of the sun" hot—so plan accordingly.

10

Lassen Volcanic National Park, California

Image: Robson Hatsukami Morgan

This park sits on top of one of the world’s largest plug-dome volcanoes—and yes, it could erupt again—Lassen Peak last blew in 1915, which in geological time is basically yesterday. But don't let that stop you from enjoying the bubbling mud pots, steaming fumaroles, and hot springs that make you feel like you're walking on another planet .

The hiking is fantastic, with everything from easy boardwalk strolls through geothermal features to challenging climbs up Lassen Peak itself. Add in alpine lakes, wildflower-filled meadows, and a fraction of Yosemite’s crowds (despite being just a few hours south), and you’ve got a spectacular California secret.

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.

1

There's an unexplained billion-year gap

Look closely at the canyon walls, and you'll notice something strange: a clean, sharp line where ancient rock simply stops, and a much younger layer begins directly above it.

This geological puzzle is called the "Great Unconformity," and it represents over a billion years of rock layers that are simply absent , as though that stretch of time never happened. In some spots, rock dated 1.8 billion years old sits directly beneath rock that is only 520 million years old. Where did the missing billion years go?

The leading theory involves the violent breakup of an ancient supercontinent, but scientists are still piecing it together.

2

During the Cold War, it hid a nuclear fallout shelter

During the Cuban Missile Crisis in 1962, the U.S. government converted part of the Grand Canyon Caverns into a fallout shelter. This dry cave system, more than 200 feet underground, was stocked with enough food and water to sustain 2,000 people. Naturally, it was never occupied, and the supplies were never used.

The caverns have since been transformed into a tourist attraction, with organized tours winding through the same underground chambers that were once intended as a refuge from nuclear war. You can even book a night's stay there.

3

The Federal Aviation Administration was founded after a crash over the canyon

In 1956, two commercial passenger planes collided in midair over the eastern Grand Canyon, killing all 128 people on board both crafts. Rescue teams struggled to reach the wreckage deep inside the canyon, and the extreme heat of the crash had caused the planes' aluminum to fuse with the bedrock. There were no survivors.

The disaster exposed a terrifying truth: the U.S. air traffic control system was dangerously outdated, relying on pilots' visual estimates and rough guesswork from controllers , with no way to separate fast-moving aircraft from slow ones, or instrument-flying planes from those navigating by sight. Congress responded by passing legislation that created both the Federal Aviation Administration (FAA) and the National Transportation Safety Board.

4

A hoax suggested that an Egyptian civilization had lived there

In 1909, the Arizona Gazette reported that an explorer named G. E. Kinkaid had discovered a vast underground citadel inside the canyon, filled with artifacts linked to ancient Egyptian civilization. He even claimed the expedition had been funded by the Smithsonian.

This story described hieroglyphics on the walls, mummies in the chambers, and relics pointing to a direct connection with the Egypt of the pharaohs. It was incredibly detailed, and it was, of course, a hoax. No evidence for any of Kinkaid's claims ever surfaced.

5

Fewer than 100 people have ever hiked its full length

Among the few people who have completed the through-hike of the Grand Canyon is Jen Hogan, the first woman to accomplish it, finishing her journey in 2021–2022.

It’s a full 800-mile length below the rim. The route involves extreme heat, flash floods, near-impassable areas, and stretches with no water or trail whatsoever. Around 60 or 70 people have reportedly accomplished it. This makes it one of the most exclusive feats on Earth.

6

The Grand Canyon's rocks predate dinosaurs entirely

Visitors scanning the canyon walls for fossils are often surprised to learn they won't find any dinosaur bones here. The rock layers of the Grand Canyon are simply older than dinosaurs. This fact alone can be shocking: staring at its walls means staring at marine fossils from as far back as 1.2 billion years ago. Some of its caves hold the remains of ancient mammals. The canyon is a window into a world that existed long before the dinosaurs, when the land that is now Arizona lay beneath a shallow sea.

7

The park is bigger than Rhode Island

Numbers alone rarely capture the Grand Canyon's scale, so here's a different approach. Rhode Island covers about 1,214 square miles, and the Grand Canyon National Park spans 1,904 square miles.

The canyon's depth exceeds four Empire State Buildings (which is 1,454 feet) stacked on top of one another. That’s 6,093 feet at its deepest point.

8

But it's not the deepest canyon on Earth

For all its grandeur, the Grand Canyon does not hold the depth record. Pictured above, the Yarlung Tsangpo Grand Canyon in Tibet, China, plunges to 17,567 feet, which is nearly three times deeper. Carved by the Yarlung Tsangpo River as it cuts through the eastern Himalayas, that canyon is so remote and extreme that it remained largely uncharted until the late 20th century.

9

It is home to a pink rattlesnake found nowhere else on Earth

The Grand Canyon Pink Rattlesnake has a pinkish-red coloring that matches the canyon's own distinctive rock walls so closely that it's nearly invisible. It is found nowhere else in the world. Officially classified as Crotalus oreganus abyssus , it has darker diamond-shaped markings along its back that deepen the camouflage further.

10

There's a village at the bottom: Supai Village

For over 1,000 years, the remote village of Supai has been home to the Havasupai Tribe, the People of the Blue-Green Waters. It is located an eight-mile hike from the rim, but sits roughly 3,000 feet deep inside the Grand Canyon.

The U.S. Department of Agriculture has called it the most remote community in the contiguous United States, and it has no automobiles and no road access. The only ways in are on foot, by mule, or by helicopter. It is also the only place in the United States where the postal service still delivers mail by mule train.