Dave Roos

The explorers not only produced maps from their 1804-1806 expedition to the American West, they also recorded some 122 animals new to science.

In 1804, Lewis and Clark set off on a journey filled with harrowing confrontations, harsh weather and fateful decisions.

Sunk by earthquakes or swallowed by rising tides, these five underwater settlements hold artifacts and clues to ancient life.

Evidence of powerful earthquakes linked to the Vesuvius eruption adds to the story about why so many people perished at Pompeii in 79 A.D.

A brash, self-made millionaire helped fund the fight for independence, but after the war, he ended up in debtor's prison.

As colonists faced tough odds in the Revolutionary War, America's first diplomat worked his charm to win France's vital backing.

While many American patriots gushed about the political effectiveness of the ‘Destruction of the Tea,’ others thought it went too far.

Federalism, or the separation of powers between state and federal government, was entirely new when the founders baked it into the Constitution.

The Founding Fathers had just broken free from one empire, and the idea that foreign power could influence their young democracy was a prominent source of anxiety.

Lasting just 30 seconds, the 1881 showdown in Tombstone became one of the most famous shootouts in American history.

The shocking deaths of seven people in the Chicago area from tampered bottles led to a massive recall—and generated fears around candy poisonings.

For six days in 1971, nine college students were locked in a fake prison. The outcome was shocking.

These are main theories surrounding what happened to the legendary aviator and her navigator.

The Niña and Pinta were lost to history, but the wreck of the Santa María is somewhere near Haiti.

A powerful El Niño triggered devastating droughts and famines around the world, leaving millions dead.

Mrs. O’Leary and her cow have been unfairly blamed for over a century.

An 1838 photo that accidentally captured a man getting a shoe shine on a Paris street was almost lost to history. Twice.

Martial law is a temporary state of military rule during an emergency. Leaders have exploited martial law to suppress political opposition.

The ancient Celts were a widespread group of tribes whose rich culture has been identified through burials, artifacts and language.

*Tyrannosaurus rex* was likely warm-blooded, but what about other dinosaurs?

Midterm elections are held on even-numbered years between presidential elections. These 5 midterms flipped control of Congress.

The FBI released two sketches of the Unabomber suspect: the first in 1987 and a second, which became iconic, in 1994.

Stories from ‘102 Minutes Inside the Towers’ reveal what people in the World Trade Center saw and experienced on September 11, 2001.

Over 35,000 volunteers from 52 countries poured into Spain to help fight the rise of fascist-backed Nationalists led by Francisco Franco.

Epiphany—Theophany or Three Kings Day—is a Christian holiday, celebrated in January, honoring the events occurring after the birth of Jesus.

From the start, state fairs have attracted crowds with livestock competitions, rides and tasty food.

In 1969, a homely device helped launch the video game industry.

Standards of education varied widely, and corporal punishment was the norm.

From co-founding Ms. magazine to leading marches, Gloria Steinem spent decades fighting for women’s rights.

Wrenching audio recordings and transcripts reveal the human cost of the historic tragedy.

What did they eat at the first Thanksgiving? When did Thanksgiving became a holiday? Get Thanksgiving trivia to share around the table.

Columbus's famed voyage to the New World was celebrated by Italian-Americans, in particular, as a pathway to their own acceptance in America.

Incredibly, there are roads dating back millennia that are still in use.

The exact location of the ancient, gnarled bristlecone pine is kept secret for its protection.

Archaeologists have found remarkable human-made objects dating back hundreds of thousands (and even millions) of years.

The challenge lies in defining what qualifies as a civilization. 

They have actually been around since ancient times.

The first version of a magnifying lens dates back more than 2,700 years ago.

The luxury liner’s collision with an iceberg set off a tragic chain of events.

A 40-hour, five-day work week is now standard for full-time jobs in America, but that wasn't true until the 1930s.

Did humans first set foot in the Americas after walking—or sailing or paddling by sea?

Sweets and starches played an essential role in evolution, study says, especially for the brain.

Hint: It wasn't a carnivore.

The history of the bison is intertwined with Native Americans, for whom the animals were spiritual equals—and a vital resource.

The short-lived 19th-century party focused on anti-immigrant policies.

Shrouded in secrecy, both orders were founded on Enlightenment principles, but only one still exists.

Yasgur's farm looked like a 'war zone,' but months later, all the garbage was gone.

The Aztecs combined two interlocking calendars into a 52-year cycle that set the rhythms of daily life and sacred rituals.

On August 13, 1961, Berlin woke up to a city divided by barbed wire and armed guards.

Neil Armstrong’s celebrated “one small step” was far from the most dangerous maneuver in the effort to send three men to the moon and return them home a week later. See a timeline of the entire mission.

For more than 130 years, the government has issued advice for healthy eating.

Although Montana is the fourth-largest U.S. state by area, it's also one of the least densely populated states.

Maine is the largest state in New England and forms the northeast border of the United States with Canada. It has been a state since 1820.

“The Old Line State” is known for its diverse geography and crucial role in the nation’s history.

The state is one of the nation's top producers of wine, hazelnuts and Christmas trees.

Idaho farmers produce more potatoes and trout than any other state in the nation

Pennsylvania was founded by William Penn as a haven for his fellow Quakers.

Kansas, situated on the American Great Plains, became the 34th state on January 29, 1861. Its path to statehood was long and bloody.