An eatery for UFO seekers on the Extraterrestrial Highway.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

The best Tiki bar in Las Vegas.

A network of concealed passageways lies within a busy London Underground station.

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

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

Catacombs turned marketplace.

A hands-off space for graffiti artists to hone and display their skills.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

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

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.