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The disaster exposed a terrifying truth: the U.S. air traffic control system was dangerously outdated, relying on pilots' visual estimates and rough guesswork from controllers , with no way to separate fast-moving aircraft from slow ones, or instrument-flying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.

1

Movie etiquette slides: The "don’ts" of early cinema

Image: Alex Litvin

Long before "silence your phones" became a common phrase, the audience was advised to mind their manners with whimsical "movie etiquette" slides. These slides, from the early 1900s, reminded theatergoers to behave properly while in the establishment. Suggestions like "Applaud with hands only" were a gentle nudge to stay courteous—after all, what else would one applaud with, right?

Another classic recommendation: "If annoyed when here, please tell the management," a precursor to modern customer service advice.

2

America’s birth certificate: The map that named a continent

Image: Chris Lawton

Does America have a birth certificate? Not exactly, but something like that—hear this out. It’s actually a map that holds the unique honor of using the name "America" for the very first time . Created by Martin Waldseemüller in 1507, it has a lengthy Latin title and shows an emerging understanding of the globe, especially the newly discovered Western Hemisphere and Pacific Ocean.

For the first time, a cartographer separated the Americas from Europe and Asia, recognizing them as distinct continents. The Library of Congress acquired the map in 2003 and is often referred to as America’s "birth certificate."

3

A Monopoly prequel: The Office Boy

Image: Jaciel Melnik

Before Monopoly was monopolizing (pun intended) family game nights, Parker Brothers tested the waters with a lesser-known board game called "The Office Boy." Released in 1889, this early game was all about climbing the corporate ladder , reflecting the "American Dream" narrative popular at the time.

Players began as humble stock boys and had to work their way up to the head of the firm, with virtues like integrity and promptness helping them along, while carelessness could set them back. Pretty much like real life, huh?

Although "The Office Boy" never reached the same iconic status, it’s a fascinating precursor to Monopoly and you can take a look at it at the Library of Congress.

4

Locks of famous hair: A snip of history

Image: Taylor Smith

It might sound strange today, but saving locks of hair from notable figures was a common practice in the past. The Library of Congress holds strands from historical figures like Thomas Jefferson, Walt Whitman, and James Madison.

Along with the locks, you can also learn some interesting facts. For example, Jefferson’s hair was cut at his deathbed by his family, while Whitman’s came courtesy of his housekeeper, who took the liberty of snipping a few strands. These tiny, personal (maybe too personal) belongings have lost their shine over the years, but they still connect visitors to some of the most influential figures in history.

5

Bizarre health labels: Fat-Ten-U tablets, anyone?

Image: Jenelle

We might find it hard to believe at times, but societies do change. Want to see how? Take a look at advertisements from a certain era, and you’ll notice the early 20th century had its fair share of questionable health products—some of them can be found at the Library of Congress.

For example, one product you can take a look at is "Loring’s Fat-Ten-U Food Tablets," which promised to help skinny folks gain weight quickly . The accompanying ads featured dramatic before-and-after illustrations of people plumping up into "rosy" health with these tablets.

Compare that with today, and you’ll see that marketing, fads, and science have certainly come a long way, don’t you think?

6

The first road map: Paving the way for American travelers

Image: LouisMoto

We’ve mentioned the first map to name America as a continent, but have you ever wondered who the first person to draw a roadmap of the US was? Well, you can learn about that at the Library of Congress.

Back in 1789, when George Washington became president, Christopher Colles published what is now considered the first road map of the United States . His guide, titled A Survey of the Roads of the United States of America , helped travelers navigate the relatively new nation. Rather than displaying large swathes of territory, each page zoomed in on short stretches of road, making it much easier to navigate.

Of course, if you look at it today, it is outdated, but back then, it made traveling around the country a lot easier!

7

Culinary advice for motorists: Gourmet on the go

Image: Debby Hudson

One doesn’t usually—or immediately—place a motorist in a kitchen, right? But we guess this is here to prove us wrong!

When early motorists hit the road, there weren’t fast-food chains or convenience stores on every corner. This posed a problem, but the solution came around rather quickly: The Motorist’s Luncheon Book by May Southworth, published in 1923, provided travelers with the advice they needed to plan their meals on the go. The book suggested packing emergency supplies like sardines, canned frankfurters, and even "bacon in jars" and some recipes to cook on the road.

If you’re ever out of ideas in the kitchen, you might want to get a quick look at this book!

8

Jefferson’s vanilla ice cream recipe: Founding Father of desserts

Image: Hidden

Wait, Jefferson—as in the Founding Father? That’s right. Thomas Jefferson may have helped write the Declaration of Independence, but he also knew how to make a mean vanilla ice cream.

Among his vast collection of papers at the Library of Congress is his personal recipe for the classic dessert . The recipe is as simple as it gets: just "good cream," egg yolks, sugar, and vanilla. Jefferson, known for his love of French cuisine, likely picked up this ice cream-making skill while serving as a diplomat in Paris. While the recipe is quite detailed, it’s a reminder that even the most powerful figures in history had a sweet tooth. You could honor him by making this for your loved ones tonight!

9

The first known book printed in America: The Bay Psalm Book

Image: Aaron Burden

We all know what the first printed book in the world was, right? But what about the first printed book in America? Here’s what you need to know about it.

North America’s first printed book, The Whole Booke of Psalmes , also known as The Bay Psalm Book , dates back to 1640, just two decades after the Mayflower landed. This hymnal was created in the Massachusetts Bay Colony and contains psalms translated from Hebrew into English—but with a twist: the spelling and grammar were, well… creative by modern standards.

The book has no music notes, just the lyrics for worshippers to follow along with. Though simple in appearance, it pretty much marks a milestone in American printing and religious history.

10

Helen Keller’s plea to Alexander Bell: A message of hope

Image: Anne Nygård

As you probably already know, Hellen Keller was both deaf and blind. But that was never an obstacle to her journey of self-improvement and activism for the rights of the disabled. She is, still today, one of the most influential figures in history.

Now, concerning this article, here’s the fascinating artifact’s history: In 1907, Helen Keller sent a telegram to Alexander Graham Bell, the inventor of the telephone and an advocate for the deaf. In it, Keller, who was both deaf and blind, asked Bell to join her in delivering a speech , hoping he would repeat her words aloud for the audience. This small but powerful telegram is now part of the Library of Congress’s collection and you can take a look at it to learn about the deep bonds formed between two icons of American history.

1

Sliced bread

Image: Laura Ockel

Not even the best of inventions are safe from odd bans. In 1943, the U.S. government temporarily banned pre-sliced bread as part of wartime resource conservation .

Thankfully, the ban only lasted a few months. Housewives, bakeries, and even newspapers complained, arguing that sliced bread was a necessity. The ban was lifted quickly due to public backlash.

2

Pinball machines

Image: Louie Castro-Garcia

Believe it or not, from the 1940s until the mid-1970s, pinball machines were outlawed in several major cities, including New York and Chicago. Officials claimed the machines promoted gambling and corruption .

Machines were confiscated and destroyed. The ban finally ended when it was proven that pinball was more skill-based than luck, leading to its revival as a popular arcade game.

3

Yo-Yos

Image: Eric Prouzet

During the 1930s, some U.S. towns banned yo-yos, believing they caused bad luck and distracted children from schoolwork . The fad was seen as both frivolous and superstitious.

Though short-lived, the bans show how something as harmless as a toy could spark moral panic and strange local laws.

4

Christmas

Image: Erwan Hesry

In the 1600s, the Puritans of Massachusetts Bay Colony banned Christmas , claiming it was rooted in pagan traditions and encouraged rowdy behavior .

Anyone caught celebrating risked punishment or fines. It wasn’t until the mid-1800s that Christmas gained widespread acceptance in the U.S.

5

Dancing after midnight

Image: Scott Broome

At different occasions during the 20th century, some cities enforced laws that restricted or outright banned late-night dancing . New York City’s "Cabaret Law" limited dancing to licensed venues only.

Authorities argued it was about maintaining order, but many saw it as cultural repression. By the 1990s, these laws faced strong opposition, and most have since been repealed, allowing nightlife to thrive.

6

Comic books

Image: Waldemar

Comic books have been a scapegoat for different things in different periods. For example, in the 1950s, they came under fire, accused of corrupting America’s youth . Parents, educators, and politicians believed violent and horror-themed comics encouraged delinquency.

Entire towns banned sales, and even public book burnings took place in different corners of the country.

7

Yellow margarine

Image: Marine Le Gac

Being a substitute for butter, margarine was heavily lobbied against by dairy farmers in the late 1800s. Several states passed laws banning margarine dyed yellow to resemble butter .

As a result, margarine was sold plain white, or consumers had to mix in dye packets themselves. These odd restrictions lasted well into the mid-1900s before finally being repealed.

8

Men’s long hair

Image: Siri louis

During the 1960s and 70s, schools across the U.S. cracked down on boys with long hair . Beatles-inspired styles were viewed as rebellious, unclean, and disruptive.

Some students were suspended or expelled over hair length. These policies reflected the cultural clashes of the era.

9

Left-handed writing

Image: Anna Savina

For much of the 19th and early 20th centuries, left-handed students were forced to switch hands . Teachers tied their left arms or punished them until they wrote with their right hand.

This practice was based on superstition and prejudice, with left-handedness considered "wrong" or even sinister.

10

Bathing suits above the knee

Image: Brett Jordan

In the early 1900s, strict laws dictated swimwear modesty at public beaches . Bathing suits that rose above the knee could result in fines or even arrest by "beach police."

Photographs from the time show officers measuring swimsuit lengths with rulers. The bans slowly disappeared as fashion and social norms shifted.

11

Coffee

Image: Jakub Dziubak

In the late 1600s, in Boston, coffee was briefly banned for being considered dangerous and unproductive . Authorities feared it encouraged idleness and vagrancy.

Coffeehouses were seen as gathering places for gossip and dissent. The ban didn’t last long, and coffee soon became a staple of American culture, eventually surpassing tea in popularity.

12

Velvet Elvis paintings

Image: Susan Mohr

In the 1970s and 80s, velvet Elvis paintings became a kitschy art craze. Some towns, embarrassed by the trend, tried banning their sale, calling them indecent or tacky .

Though the bans were rarely enforced, they reflected how taste and morality sometimes crossed into law.