Elegant marble and old vaults fill this historic Dutch bank turned office space.

A former plague hospital turned medical museum.

Artfully arranged bones of 5,800 Austrians.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

This medieval castle was painted pink as part of a now-abandoned children's theme park.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

A bizarre form of natural mummification was discovered in the church of this Frisian village.

Pull up and have a drink at a museum filled with hundreds of years worth of shipwreck artifacts.

This historical Netherlands fortress still bears the marks of its single siege.

Survival capsules find a second life as a unique hotel.

This miniature take on the Kremlin is one Dutch man's retirement project.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

A miniature city, once ruled by the Queen of the Netherlands.

A grassy pyramid named after a French battle.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

The attic of a four-century-old canal house hides a clandestine church.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

Cat art as far as the eye can see.

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

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

Festival of Perpetual Life and Rebirth.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

Hungarian mummies in beautiful painted coffins.