One of the largest mines in Bulgaria is now home to a vast museum more than 100 feet underground.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

This medieval mountain town is also known as the "Village of Streams."

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

This clifftop arch is a natural stunner.

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

Contains some of the world's more disturbing wax anatomical models.

A collection of grotesques lines the walls of this Italian villa.

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

An extraordinary collection of 18th century anatomical waxworks.

A fake medieval village in the middle of Turin.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

The mystic whose incorrupt corpse still attracts the faithful.

Armenian monks at an island monastery in the Venetian Lagoon make a rare rose petal jam.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

The location of the last witch trials of Italy, known as "The Salem of Europe."