The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

Museum dedicated to wax representations of disfiguring diseases.

Longest fortress system anywhere in Europe.

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

One of the oldest churches in Romania is believed to have been built on the site of a pagan temple.

No one knows who built this strange cave of worship or exactly why.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This massive underground salt mine now holds a sci-fi theme park in its depths.

Moss and stone turn this waterfall into an otherworldly liquid veil.

This ruined fortress was the stronghold for a persecuted medieval leader and his infamous Assassins.

Peru’s only toy museum houses everything from pre-Inca whistles to lead soldiers and terrifying dolls.

This experimental utopian "city of the future" in rural India may hold a dark secret.

Houses are tucked between, on, and underneath giant boulders.

This Scottish manor house is a lush relic from the life of a literary great.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."