Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

An eccentric artist's abode in this small Italian town has been transformed into a surreal temple of mosaic madness.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

Every Easter, a small Sicilian town builds a stunning cathedral out of bread.

A petite white lighthouse perched on the ancient core of Stromboli Volcano.

Every inch of this chapel is covered in craftsmanship from across the world.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

Gorgeous views of Italian mountains and valleys form the backdrop of this unique open-air theater.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Overlooked amid the tourist bustle of Florence, this museum is dedicated to the craft of stone inlay.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

A striking symbol of the Bulgarian capital.

This historic black and white monastery is one of Bulgaria's architectural jewels.

An abandoned saucer-shaped monument in the Bulgarian mountains.

A 16th-century horror show built in a lovely Italian garden.

Medicinal spa created with the discharge from a geothermal energy plant.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A collection of grotesques lines the walls of this Italian villa.