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

Lavish royal estate punctuated with heated greenhouses.

The Devil’s own choice when he needs a drink in Brussels.

This peculiar museum offers hands-on interaction with seemingly intangible principles of mathematics.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The fairy tale castle of the "fairy-tale king."

One of the oldest masonic temples in the Netherlands, built in 1757.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

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

Incredible labyrinth of man made caves.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

Strange secondhand shop showcasing taxidermy and oddies

A preserved building where the dead were once watched for signs of life.

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

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

A collection of biblical memorabilia.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

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.