Illegal drag racing two stories beneath Chicago’s streets.

The first park built over a freeway is a brutalist masterwork.

The remains of an abandoned air force hospital located on a redeveloped Air Force base.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

A whimsical bridge adorned with decorative dragons.

An old-timey peepshow allows visitors to gawk at some of the world's most freakishly large footwear.

San Francisco's newly reopened hands-on science museum.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Abstract dinosaur models in London.

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

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

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Famously misunderstood wonder of the ancient world

Home to the most complete dodo remains known - one head, and one foot.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

New Orleans' famous cemetery, located on the site of a former race track.

A snapshot of the city's fascinating voodoo culture.

This sandstone mansion was the home of two of Oregon's most important pioneers.

Statues of Ramona Quimby, Henry Huggins, and Ribsy the dog in the park where their adventures "really happened."

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

These ancient sacred grounds granted amnesty to those who managed to reach them.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

Watch the newest land on the planet form before your eyes.

A beach made of semi-precious green sand on the Big Island of Hawai'i.