This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

Indents in the pavement are all that remain from a grisly death machine in Paris.

The world's largest collection of witchcraft regalia.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Artfully arranged bones of 5,800 Austrians.

A church of bones, decorated with 40,000 human skeletons.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

Mysterious painted skulls in Moravia.

Europe's second largest ossuary wasn't discovered until 2001.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

This hospital once pioneered the use of electroencephalograms, but fell into maltreatment, abuse, and eventual abandonment.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

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

The decaying ruins of Wales' first asylum for the mentally ill.

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

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.