One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

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

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

America's only nuclear missile silo open to the public.

This historic national park is covered in the stunning ruins of red rock pueblos.

A stealthy Apache hideaway that became the haunting site of a mass grave.

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

Eons ago, a rushing lava river formed this pristine passage through solid rock.

A self-built castle made by a mysterious man.

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

A reproduction of earth's many biomes.

Museum celebrating the history of computers, especially their role in codebreaking.

Home to Alan Turing, the cracking of the Enigma code, and Captain Ridley's shooting party.

A small sculpture garden that provides a microcosmic representation of California.

Fourteen curious and controversial white bunnies sit in a circle near Newport Beach City Hall.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

The phrase "the shot heard around the world" was coined after a skirmish at this bridge.

The natural hot spring that was integral to the creation of Canada's first national park.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

Explore a misty river canyon from a metal bridge system.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

A Victorian marvel of engineering is now a 21st-century tourist attraction.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.