Archduke Ferdinand II's collection of rare objects is considered one of the oldest museums in the world.

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.

This gruesome biblical parade celebrates the one day a year that a bit of Jesus' blood turns to liquid.

A huge old mansion full of thousands of toys, each there to be used and played with.

A once-magnificent collegiate church is falling into ruin.

A Cold War command center is hidden under an idyllic countryside.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

Artist's eccentric property excessively decorated with found objects and work of his own.

One of the oldest masonic museums in Paris.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

A modern-day Lascaux cave underneath Paris.

One of the greatest maze designer’s greatest mazes.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

The first green space constructed on an elevated viaduct.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

A taxidermied stork with an arrow through its neck proved that birds migrate.

This highrise residential building looks mundane, but hides a water tower and WWII bunker.

This German museum devoted to the simple wonders of salt is actually built over an old saltworks.

This natural history museum houses one of the world's largest rat kings, a terrifying jumble of tangled rodents.

A graveyard and memorial chapel for victims of leprosy.

A beautiful collection of taxidermy birds and rare pomological wax models.

The castle where Martin Luther secretly translated the New Testament from Greek to German while in hiding.