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United States flag

For years, Americans loved telling the story of Robert G. Heft , the Ohio high school student who supposedly designed the modern 50-star flag as part of a class project in 1958. According to the tale, his teacher gave him a B minus, only to change it after President Dwight Eisenhower selected his design for the nation.

But real history turned out to be more complex. When Alaska and Hawaii officially joined the U.S. in 1959, the government received roughly 1,500 proposals for a new flag. In 2022, writer Alec Nevala-Lee dug deeper into the records and found that the final version was actually credited to the U.S. Army Institute of Heraldry, not a teenager from Ohio. The current version first flew in 1960 and has now lasted longer than any other American flag design. Those 13 stripes still honor the original colonies, while the 50 stars honor the states.

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National anthem: "The Star-Spangled Banner"

You’ve probably sung it hundreds of times, but did you know that "The Star-Spangled Banner" didn’t begin as a song? Our national anthem started as a poem written during one of the most dramatic moments in early American history.

In September 1814, lawyer Francis Scott Key watched from a ship as British forces bombarded Fort McHenry near Baltimore, Maryland. The darkness was heavy, but at dawn, Key spotted the American flag still waving over the fort. That moment inspired him to write a poem called "Defence of Fort M’Henry," and the melody that kept matching in his head for the poem was borrowed from an old British drinking song called "To Anacreon in Heaven," from 1775. Ironic, considering the circumstances. The song became widely popular across the country, but it became the official national anthem in 1931, under Hoover’s presidency.

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Pledge of Allegiance

For generations of Americans, the school day began the same: standing by a desk, hand over heart, facing the flag. But the Pledge of Allegiance has changed since it was first written in 1892 by Francis Bellamy for a nationwide Columbus Day Celebration.

The original version didn’t even mention the U.S. by name. Children simply said, "I pledge allegiance to my flag." Years later, in 1923, the words were changed so that every school kid, native or immigrant, would think of "the flag of the United States of America" when reciting it.

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National bird: bald eagle

The first relevant appearance of the bald eagle wasn’t as the national bird; it was in the design of the Great Seal. This was in 1782, when the first committee appointed to design the task suggested this bird. The committee was formed by John Adams, Thomas Jefferson, and Benjamin Franklin, who was the only one who thought of the bald eagle as a bird of "bad moral character." Jefferson and Adams, instead, thought the bald eagle represented strength and independence, which seemed perfect for a young country trying to stand on their own. Moreover, the bird was unique to North America at the time, which made it feel distinctly American.

While it has appeared on the Great Seal, currency, and documents since that year, it was only in 2024 when it was designated as the national bird by an Act of Congress under Biden’s administration.

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National motto: "In God We Trust"

Many Americans assume that E pluribus unum is still our national motto, but in 1956, that changed. The modern motto "In God We Trust" first appeared during one of the country’s darkest moments.

In 1864, as the Civil War tore the nation apart, several religious leaders urged President Lincoln to recognize God on American currency. Many believe the nation needed a symbol of faith and stability during such uncertain times. That same year, the motto appeared for the first time on a two-cent coin. But it was during the Cold War in the 1950s that the words took on new importance and officially became the national motto in 1956 when President Dwight D. Eisenhower signed the law.

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Great Seal of the United States

The seal is printed on passports, official government documents, and even the back of the one-dollar bill. It features a complex design, and every detail on it means something.

The story of the Great Seal begins on the 4th of July, 1776, when the Continental Congress recognized that the new nation needed a seal to sign official documents. But that was just the beginning. Six years and three committees later, in 1782, Charles Thomson, Secretary of the Continental Congress, designed the seal we know today. The olive branch and the arrows held in the eagle’s talons denote the power of peace and war. The eagle faces the olive branch, but gazes toward the arrows, meaning it’s ready to defend. The 13 stars honor the colonies, and the escutcheon represents the eagle’s courage, along with the motto E pluribus unum, which was the official motto at the time.

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National march: "The Stars and Stripes Forever"

Today, no Independence Day is complete without the bass of "The Stars and Stripes Forever," but its origin goes back to 1896. The national march began during a difficult trip across the Atlantic.

In 1896, composer John Philip Sousa was traveling home from Europe after learning that his close friend and business partner, David Blakely, had suddenly died. As Sousa paced the deck of a ship, a melody kept playing in his mind. By the time the ship reached New York, the entire march had taken shape. Inspired by the American flag waving as he returned home, Sousa later added the title we know today. But it was on December 10, 1987, that the march was named the "Official March of the United States of America" under Reagan’s administration.

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National mammal: American bison

Long before highways crossed the country, bison herds thundered across the American grasslands from Texas all the way to Canada. But in the late 1800s, hunters began massively exterminating them to the point of extinction. Oddly enough, that’s when Americans began paying attention to them. Bison started appearing everywhere: on state flags like Wyoming’s, official seals, coins, and giant statues in cities across the country.

President Roosevelt became a big defender and helped create the American Bison Society in 1905 to protect the remaining herds. More than a century later, in 2016, Congress officially named the bison the national mammal of the U.S. and, today, more than 400.000 bison once again roam American grasslands.

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National floral emblem: rose

Roses have been part of American life for generations. In 1986, President Ronald Reagan signed Proclamation 5574, declaring the rose the national floral emblem of the United States. This choice was highly practical since roses are grown in all fifty states and have been cultivated in American gardens since the nation’s inception. Reagan noted that Americans have long used the rose to "speak the language of the heart," making it a fitting symbol for the country.

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National tree: The Mighty Oak Tree

The oak tree didn’t become America’s national tree through congressional debate alone. In 2004, the National Arbor Day Foundation opened the decision to the public, and Americans of all ages cast votes for their favorite tree over four months. From the start, t he mighty oak was the frontrunner, earning more than 101,000 votes and beating out redwoods, maples, and pines.

The choice came from the symbolism behind it. Oaks are some of the most widespread trees in the country, with more than 60 species stretching across the states. Besides, it carries roots in American history: The USS Constitution earned the nickname "Old Ironsides" because its oak hull was strong enough to repel British cannonballs during battle. Strong, enduring, the oak was a perfect match.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.