An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

An architect's childhood fantasy treehouse made real.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

These giant metal horses graze on a hilltop near the Montana highway.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

Museum dedicated to awful artwork.

At the "Garage Mahal" in Houston, car culture is about more than just driving.

Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

One home in the historic strip hides secret compartments and the ghostly songs of long-gone canaries.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The source of America's longest river is also a historical landmark and the start of a famous nude run.

The old fire tower is one of the last of its kind in the United States.

The shortest river in America flows for just 201 feet.

At 11,500 feet in elevation, there is no toilet in the state closer to the sky than this one.

These free-roaming horses were once destined to disappear from the land.

This natural wonder is disappearing at an alarming rate.

In 1909, the steepest and most difficult piece of track on the Canadian Pacific Railway was replaced with a series of spiralling tunnels cut into the mountains.

Fossils, railroads, and waterfalls!

Odd outsider art installations surround a Gold Rush-era ghost town.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Most-visited and most-photographed slot canyon in the American Southwest.