This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

This tidal island, a sacred site in early English Christianity, was the target of a notable Viking invasion.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

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

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

Roman ruins, natural methane fires and a lovely beach.

Flames have been burning within this mountain for more than 2,500 years.

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

Three bridges and one giant canyon make up this fantastic Spanish settlement.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

At night, bats patrol this magnificent 18th-century space in search of book-eating pests.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

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

A small Portuguese cottage formed between boulders in the countryside.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Commonly acknowledged as the only public monument to the Devil himself.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

A fiery crater has been burning in the Karakum Desert since 1971.