A historic building houses one of the most important archaeological institutes in Europe.

An ancient tunnel in Jerusalem built to redirect water in the event of a siege is one of history’s great architectural innovations.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

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

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

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

A beautiful geyser under environmental threat.

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

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

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

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

Ancient pueblos built into the base of a natural canyon wall.