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

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

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

Natural cathedral designed by Italian artist Giuliano Mauri.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

An Italian hillside ghost town.

Abandoned medieval hill town.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

The glowing blue Nymphaeum of Emperor Tiberius.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Geothermal waterfalls in Tuscany.

Renaissance villa and gardens complete with a tormented colossus.

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

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

Tucked away inside a historic Savannah hotel is a hundred-year history presented in ladies' lids.

The "last unrestored grand mansion of Savannah" is now a cramped, mouldering maze of antiques.

The unbelievably opulent home built for an infamous newspaperman.

Scale replica of China's ancient terracotta tomb warriors and Forbidden City are the side project of an eccentric millionaire.

255 feet of suds, scrubbers, and blow dryers.

A 90-year-old underground water reservoir offers a more industrial kind of tranquility.