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

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

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.

Historic church where a number of Shakespeare's actors are buried.

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

A cluttered and astounding collection of antiquities and curiosities.

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

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Artworks by loners, prisoners and the criminally insane.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

A curious collection dedicated to human and animal anatomy and pathology.

The world's only museum devoted to the wonders of fluorescence.

A former plague hospital turned medical museum.

A small world of mechanical magic and metal merry-go-rounds in a Outsider art Museum.

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

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.