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, Hortus Botanicus Amsterdam 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.