This sinister Baroque entryway could lead you to a terrible fate.

A church of bones, decorated with 40,000 human skeletons.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

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

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

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

A curious cave church carved into the face of a cliff.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

Celebrated example of Ottoman architecture that also served as a site for brutal massacres.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

A sinuous path among steep cliffs creates a stunning sight in southwestern Serbia.

These ruins on Mont Tantané dates back to the Iron Age, but there is limited evidence for why a village was built so far from water or other resources.

An abandoned bell tower in the middle of nowhere is the last testimony of a forgotten medieval village.

A perfectly preserved example of a fortified Medieval ricetto.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This brightly-colored chapel is a contemporary jewel standing in the middle of a La Morra vineyard.

Tens of thousands of ancient rock carvings hidden in the heart of a French national park.

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

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This monumental fountain has moved around the city multiple times.

For hundreds of years, this huge figure has been blessing visitors before they explore his body.