1

It was built for the Seattle World’s Fair

Image: Seattle Public Library, No restrictions, via Wikimedia Commons

The Space Needle wasn’t supposed to be a permanent monument. It was completed in 1962 specifically for the Seattle World’s Fair, an event aimed to highlight science, technology, and forward-looking design. During the fair, the tower helped visitors orient themselves within the Seattle Center grounds and served as a central meeting point. After the fair ended, the building was not dismantled, as many other fair structures were. Instead, it remained open to the public and gradually became a regular part of the city’s skyline.

2

The original colors had distinctive Space Age names

Image: Thom Milkovic

When the Space Needle first opened, its paint scheme reflected the era’s optimism about technology and space exploration. The main tower was painted Astronaut White, while the central core used a darker tone called Orbital Olive. Accent areas were finished in Re-Entry Red, and the top featured a warm, yellow-orange color called Galaxy Gold . These names were officially used at the time and appeared in design documents and promotional materials. Although later renovations replaced this scheme with more neutral colors, the original palette shows how strongly the tower’s design was tied to early 1960s ideas about the future.

3

Elvis was there

Image: Courtney Hutchin

Not long after it opened, the Space Needle entered American pop culture. Elvis Presley filmed scenes at the tower for the movie It Happened at the World’s Fair , which was released in 1963. The filming took place shortly after the 1962 World’s Fair, when the structure was still new. At that time, many Americans had never traveled to Seattle, and television and movies were major sources of information about distant cities. Hence, the film helped introduce the Space Needle to a nationwide audience.

4

It was inspired by a UFO

Image: Patrick Hodskins

The building’s most recognizable feature, the round observation deck, was shaped with intention. Designers chose a wide, circular form that reflected the Space Age themes common in the late 1950s and early 1960s. At the time, images of spacecraft and flying saucers appeared often in popular magazines, films, and exhibitions. The Space Needle’s top was meant to echo those ideas in a way that was easy to recognize from a distance. This design helped distinguish the tower from older observation structures and aligned it closely with the forward-looking message of the World’s Fair.

5

It was built in 400 days

Image: Andy Li

Speed mattered. Construction began in 1961, and the entire tower was completed in roughly 400 days so it could open on time for the World’s Fair in 1962. This schedule required crews to work in carefully planned stages, with steel sections fabricated off-site and assembled quickly once delivered. Concrete for the foundation and core had to be poured and set on a tight timeline. Despite the fast pace, engineers followed existing building standards, and inspections were carried out to ensure the tower could safely handle weight, wind, and daily public use.

6

Forget the elevator, take the stairs

Image: HAYOUNG CHO

Most visitors take the elevator, but the Space Needle also has stairs, 848 of them, from the base to the observation level. The stairs are primarily used for maintenance and special events rather than daily tourist access. Structurally, the tower is held together by tens of thousands of bolts and rests on a deep concrete foundation. Engineers designed the foundation and central core to withstand high winds and seismic activity, which are common in the Pacific Northwest. These construction details are not visible to most visitors, but they play a key role in keeping the tower stable and open to the public year after year.

7

It harbored a secret time capsule from the 1980s

Image: Mick Haupt

In 1982, staff placed a time capsule inside one of the Space Needle’s steel beams without a public announcement. The capsule was sealed and left in place as part of a routine update, rather than a formal ceremony. It remained hidden for more than thirty years until it was rediscovered and opened in 2017. Inside were everyday items from the early 1980s, including handwritten letters, photographs, and postcards. Several of these items were saved and included in a new capsule, which is planned to be opened in 2062 to mark the tower’s 100th anniversary.

8

It was the site of a famous April Fools’ prank

Image: Ben Mater

In 1989, a local television station aired a report claiming the Space Needle had collapsed. The segment was intended as an April Fools’ joke and included on-screen text explaining that it was not real. Even so, many viewers did not notice the disclaimer or tuned in late. Emergency phone lines and the station’s own offices received hundreds of calls from concerned residents and relatives. The reaction showed how familiar and important the Space Needle had become to people in Seattle and beyond.

9

There’s a restaurant at the top

Image: Jason Dent

Dining has always been part of the Space Needle experience. A restaurant opened with the tower in 1962 and was designed to give guests a place to eat while overlooking the city. Over the years, the restaurant has changed names, seating arrangements, and menu styles to match new trends and renovations. Despite these updates, the basic idea has stayed the same. Visitors can order food or drinks and spend extended time at the top, rather than just stopping briefly to look out the windows. For many people, the combination of a meal and a wide city view defines the visit.

10

It has the world’s first and only revolving glass floor

Image: Morgan Petroski

A major renovation in 2018 introduced The Loupe, a rotating glass floor in the observation area. The platform moves slowly, allowing visitors to stand in one place while the view changes. Through the clear panels, people can look straight down at streets, buildings, and open spaces below. This is the only revolving glass floor of its kind in the world. The addition shows how the Space Needle continues to update its visitor experience while keeping its original structure intact.

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.