The resting place for anonymous victims of the Danube's dark waters.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

This former insane asylum now holds a pathological anatomy museum.

Macabre museum devoted to historical Viennese murders.

The final resting place for the remains of 143 Habsburg royalty.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

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

The beautiful baroque library of the Hapsburg empire.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

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

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

A plaque honoring a Hungarian hero of Italy is hidden in plain sight in Palermo.

Gorgeous views of Italian mountains and valleys form the backdrop of this unique open-air theater.

The world's most active stratovolcano is almost always erupting.

A mushroom-shaped outcropping that has come to be the symbol for an entire town.

This Roman amphitheatre was also the location of the first gladiator school.

Nobles would stage mock naval battles on this large lake at the Royal Palace of Caserta.

Deceased nuns were placed on stone chairs to decompose, while the surviving nuns prayed near the lifeless bodies.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Erotic art covers the walls of the largest ancient pleasure palace.

The walls and streets of the ancient city are peppered with penises.

Ancient snack bar of the Roman Empire re-opened.

This tiny islet has somehow housed an ancient temple, two monasteries, a church, a fortress, and a restaurant.