Electrical curiosity museum housed in an old transformer station.

Where monkeys run wild and the humans are caged.

A Nazi concentration camp and Anne Frank's place of death.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

This once bustling boomtown hotel is now the hottest spot in Nevada for ghost hunters.

There's nothing creepier than a cemetery next to a clown motel.

Marta Becket's hand-painted theater in the desert.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

One of the greatest maze designer’s greatest mazes.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Eighty million natural history specimens call this gargantuan museum home.

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.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

This one has sailed five times as far as Sir Francis Drake's famous ship.

An incarceration museum on the spot of possibly the oldest prison in England.

This South London cemetery holds the remains of more than 15,000 people.

Children's hospital in London that operates on royalties received from Peter Pan, which J.M. Barrie signed over in 1929.

The anatomical-pathological collection of a man who changed surgery.