The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Banksy gives themself artistic license with this piece of London street art.

Hidden beneath the streets of London is a secret subway that only carried mail.

A kaleidoscopic warehouse-maze of handmade neon signs.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

The remains of Crystal Palace Great Exhibition of 1851.

This shrine to bovine consumption and all things fast food is a slice of culinary history both rare and well done.

It turns out that a hurricane-prone beach is probably not the best place to house wild animals.

A community of collapsing homes more than a mile out from the Florida coast.

An abandoned water sports stadium that has become a haven for graffiti and decay.

An underwater city for the dead.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

Cathedral carved out of salt, located a mile below the earth's surface.

A dangling church built over a Colombian gorge.

The Andean town where every single building is decorated with a brightly colored frieze.

A museum built around a bus-sized fossil on the side of the highway.

Sniff the Titan Arum's rotting flesh.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

The "Seinfeld" diner.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Ride the subways of yesteryear.