This 15th-century island fortress later served as home to the executioners no one wanted to live near.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

A spectacular cave and a beguiling lake.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

This beautiful Miami garden was designed as a laboratory for tropical plants.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Former villa and estate of James Deering developed to preserve native tropical forests.

In paradise, feral pigs have claimed an island all to themselves.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

A 13th century fortified house built to defend the Duchy of Burgundy.

These ancient sacred grounds granted amnesty to those who managed to reach them.

This black shoreline is made up of exploded lava particles.

Oldest unrestored plantation house in America that is open to the public.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

The hallucinogenic center of the ancient world.

The Bourbon royal family had this unique octagonal hunting "cottage" built on a tiny islet in Lake Fusaro.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Avant garde house of Pierre Cardin on the Cote d’Azur.