A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

A mocking tribute to the past and modern leadership of Prague.

Macabre astrological automaton clock dating to the late 1400s.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

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

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

Most prolific publishing house in the 1600s open to the public.

Devious political maneuvering and four ancient, working telescopes are central to the world's second-oldest observatory.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

Science meets wall art to highlight the beauty of famous mathematical equations.

A former plague hospital turned medical museum.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

A beautifully eclectic mix of architectural styles.

A beer pipeline runs beneath Bruges.

Christ's blood preserved in a Belgian town.

This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A Museum of Psychiatry in a still-operating mental institution.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles

Rummage through this sunken ship, but leave your scuba gear at home.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.