A 15th-century granary that played the role of futuristic slave quarters in the world of 'Star Wars.'

Temple complex that once housed the famous statue of Nike.

An autonomous republic of Orthodox monks.

Mysterious standing stone formations looks like a petrified forest.

Ancient Greek oracle of the dead.

Monasteries on rock pillars, once accessible only by frayed ropes.

The Jesus tree of Malta bears a striking resemblance to Christ on the cross.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

A madman's personal garden filled with 1,000 sculpted heads.

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

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

An Italian hillside ghost town.

Largest private bird collection in Iceland, formed from a tragic accident.

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

Virgil's many-mouthed gateway to the underworld.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Bridge that died in war and was resurected.

A bridge destroyed three times: once as a ruse, then in an actual attack, and finally for the movies.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

An ethereal glowing blue ocean cave in Croatia.

2300-year-old Roman road connecting the empire.

An alchemist's "magic door" stands in the middle of a Roman park.

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