Italy's curious field of mud volcanoes is named for being both gross AND salty.

Romans built the world's tallest artificial waterfall in 271 BC.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Pilgrimage site for star-crossed lovers.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

Five candy-colored villages on the Italian Riviera.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

The final resting place of the poets Shelley and Keats.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The yawning maw of this pagan visage is said to bite off the hands of liars.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

A 16th-century horror show built in a lovely Italian garden.

The city of Parma's cathedral is home to one of the greatest illusionistic frescoes of the Renaissance.

Central Europe's largest collection of mini-bottles is on display at this museum devoted to a bitter Hungarian liquor.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

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

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.