The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

Nestled in the mountains of Portugal is a tiny village made almost entirely of schist.

One of the world’s longest pedestrian suspension bridges.

A majestic hotel for dreamers rises from the center of a fairytale wood.

This museum documents the ancient practice of salt production in Figueira da Foz.

A chunk of the "true cross" is held in this small Portuguese church where modern day exorcisms are said to be common place.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

The ancient sauropod tracks found in this former quarry are some of the largest in the world.

After the owner of this Art Nouveau home died, it was turned into a museum displaying a lifetime dedicated to art.

The world's oldest bookshop still in operation.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

The classic Atari game's iconic aliens have invaded downtown San Diego.

A mining town, now abandoned, was built in a canyon so narrow that the railroad ran right through the hotel lobby.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

Home to the deepest rift anywhere on Earth.

The ruins of a medieval village that was abandoned after a 19th-century inferno.

Things seem to roll, flow and run uphill on this short patch of road near Ariccia, Italy.

This serene, turquoise lake in an extraordinary nature reserve showcases a rare natural phenomenon.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The naturally mummified body of a peasant girl saint.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."