America's most famous piece of self-built architecture.

This massive library holds what was once the largest book collection in the world.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The legendary building that needed ghostly approval before being built.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Walk through Czech history in Prague's largest graveyard.

World's largest collection of serial killer artwork and other macabre exhibits.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

A beautiful and classically designed villa, with an hourly infestation of monsters.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

A small island that was once a key Axis fortification during World War II.

Old vessels have been transformed into artistic canvases in this unusual cemetery.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.