Amsterdam's Red Light District leaves little to the imagination.

A floating cat sanctuary on an Amsterdam canal.

Cat art as far as the eye can see.

Museum preserving torture methods from the past.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Inside a former cabaret, seven floors of erotic art.

Statue of death tucked in the University of Medicine courtyard.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

The scars of World War II are preserved on its walls.

One man's personal kunstkammer, museum and shop.

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

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

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

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A museum of carnival attractions where you are invited to ride the rides.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

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

The Tübingen University anatomical collection hosts an example of an extremely rare medical phenomenon.

One of the world's oldest fossil exhibits is on display in a beautiful antique "naturalienkabinett."

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

This 18th-century folly is one of Europe's rare "garden mosques."