The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The United States’s oldest funicular railway glides up and down a steep Pittsburgh street.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

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

Pompeii's less famous neighbor is still revealing her secrets.

Hear the quietest sound from across the dome.

Enjoy an overnight at an old haunted B&B site of the Borden family murders.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

See massive fossils that are over 200 million years old in northeastern Arizona.

The "Seinfeld" diner.

One part local history, 99 parts gruesome haunted house.

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

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

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

Famously misunderstood wonder of the ancient world

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A beautiful geyser under environmental threat.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The first declared National Monument in the United States.

The site of the climactic scene from the classic horror film is now a historic landmark.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.