Mysterious hillside with a continuously burning natural fire.

The village's cobblestone streets are lined with shops displaying exquisite copper craftsmanship.

Foreign invaders almost left this lovely Caucasus palace alone—almost.

Legend says these stone structures are where the doomed citizens of a vanished village sent themselves to die.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

The decaying remains of a once-luxurious Soviet spa town.

Small church on top of a huge rock column.

These Stalin-era industrial 'death traps' hang lifeless above the city

Underground monastery and fortress.

Tower with a double-helix spiral, adorned with letters of the Georgian alphabet.

A literally moving statue of stacked metal giants just continually trying (and failing) to find love.

The first skyscraper to include a Ferris wheel built into the facade.

A gleaming white and undulating tower marks the border between Georgia and Turkey.

A beautifully eclectic mix of architectural styles.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

This bird-loving brewery is situated in an old municipal bathhouse, nestled beside a 300-year-old windmill.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

Pull up and have a drink at a museum filled with hundreds of years' worth of shipwreck artifacts.

The 20-mile causeway that separates the Netherlands from the sea.

The struggle of a small Dutch island against the sea.

This former hydraulic laboratory is now a woodland dotted with old engineering models.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.