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

A former bank seized as a sniper vantage point during the Bosnian War is now a secret graffiti art gallery.

Bridge that died in war and was resurected.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

A whimsical bridge adorned with decorative dragons.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

The "dragon babies" of southeastern Europe.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

Built on a medieval synagogue, this church has a burial crypt, tunnel system, and Jewish ritual bath hiding deep underneath.

Tourists to the mountaintop Sicilian town often overlook its ancient fortifications.

A rather vulgar example of the transition from Latin to the Italian vernacular.

A huge enchanting public park just outside the ancient walls of Rome.

Climb the dead electric pylons of Messina.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

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

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

This amazingly preserved Doric temple was abandoned before it was ever completed.

Ancient ruins hidden underneath a modern luxury hotel.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

Abandoned village in Sicily built during the agricultural reforms of Mussolini.