These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

This precariously perched fortress was once ruled by a crow-worshipping baron.

A massive natural rock arch gives the Tuscan mountain its own window to the sky.

These delicate sand pyramids look like naturally occurring gothic spires.

The bomb-ravaged remains of of a colossal Neptune.

Bell tower juts out from a village buried under a lake.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

Virgil's many-mouthed gateway to the underworld.

Walk through a fairytale in Tuscany.

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

Ancient snack bar of the Roman Empire re-opened.

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

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 Tuscan lake hides a 13th century town that is still visible when the water recedes.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

This 16th-century monastery has been turned into a surrealist architecture compound.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

Crushed coral and crystals give the sand its signature coloration.