This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

Claiming to be the oldest hat store in the world, this historic haberdashery had a hand (and a head) in the creation of the Bowler.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

David Sedaris called it "The greatest shop in the world."

The Cathedral of St. Ambrose has been hiding a special parishioner within its walls.

An ancient artistic garden parlor full of hidden water wonders.

The mark of the Devil's horns on a marble column in Milan.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

The astonishing collection of an infamous criminologist.

Glacial erratic or man-made dolmen? It probably wasn't druids.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

This grand gothic brewery has been pumping out suds for over a hundred years.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.