You haven’t properly toured a winery until you’ve slept in an actual wine barrel.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

This hidden park hosts a rogue’s gallery of eccentric architectural obelisks.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

One of the deepest indoor swimming pools in the world.

An early 19th-century English style garden hidden in the Rotterdam cityscape.

Only museum in the world devoted to bookbinding and book arts holds a permanent collection representing five centuries.

Medical history with an amazing, if frighting, collection of wax diseases on display.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Theme park featuring miniature replicas of European monuments.

Lavish royal estate punctuated with heated greenhouses.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

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

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