A subterranean house of worship carved right out of the bedrock.

Steadily reminding Czechia of its past.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Macabre astrological automaton clock dating to the late 1400s.

Monument to a suicide protesting the Soviet invasion.

Europe's largest community of crocodiles and alligators.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Beneath the city of Lourdes, France is a massive, concrete church.

One of England's most famous churches hides a pair of little known architectural treasures.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

Christ's blood preserved in a Belgian town.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Cat art as far as the eye can see.

Debatably clever, or just plain honest hotel advertised as "The Worst Hotel in the World."

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

The former home of a trailblazing surrealist is still filled with haunting dolls and grim paintings.

The world's largest boar is a huge steel titan found at a French rest stop.

A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

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

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

Petting this mysterious iron monkey supposedly brings good luck.