The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

This winding road through an Italian canyon may be the most scenic drive in the world.

Virgil's many-mouthed gateway to the underworld.

This is the oldest Roman-made bridge in the city still existing in its original state.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

Venice's island of the dead.

An ancient artistic garden parlor full of hidden water wonders.

The skulls and bones of thousands of soldiers line the walls of this small Italian chapel.

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

Ancient snack bar of the Roman Empire re-opened.

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

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

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

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.

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.

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.

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.

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