A modern sliver of architecture in Roma.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Ancient snack bar of the Roman Empire re-opened.

This Italian foot path winds through the mountains via 52 individual tunnels.

100 year tradition of fist fights, marked by marble footsteps.

One of the largest caves in the world open to the public.

The mummified relic of St. Antoninus.

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

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

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

This curious, round temple is the oldest still-standing marble building in Rome.

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

The astonishing collection of an infamous criminologist.

This abandoned Brutalist treehouse is a hidden architectural relic.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

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

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