Experience a charming 1930s version of "infotainment."

A sharp bend in a dramatic river canyon cut through red rocks.

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

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The fifth-longest natural arch in the world, and the longest outside China.

A house carved into a rock in the 1940s.

It's safe—and permitted—to walk across these twin natural sandstone arches.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

A curious art piece along a lovely biking trail marks several historic floods via a series of colorful poles that represent floodwater heights.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

An abandoned coal mine reached by a steep hike.

This too-low North Carolina railroad trestle is still a notorious big rig executioner.

Monasteries on rock pillars, once accessible only by frayed ropes.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

A piece of outsider public art accompanied by a strange urban legend.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

A tiny wilderness cemetery commemorates the deadliest episode of the Klondike Gold Rush.

Originally a brothel during the Klondike Gold Rush, this bar once used dolls to denote when ladies were working.

One of the best places to see wild Colonial Spanish Mustangs in the United States.