This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

The attic of a four-century-old canal house hides a clandestine church.

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

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

This museum offers a journey back to the Belle Epoque era of Romania.

Europe's largest dinosaur museum was founded by a passionate autodidact.

The site of Austria's biggest concentration camp now honors its victims.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

A magnificent collection of imperial armor and weaponry.

Austria's very first and only nuclear power station was completed but never used.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A submerged archeological park still holds the wonders of a Roman Sodom.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Two stunning 17th-century libraries and a cabinet of curiosities.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Terrifying derelict military hospital once housed a recuperating Hitler.

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