A giant portrait of an ancient king looms over the river.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This massive underground salt mine now holds a sci-fi theme park in its depths.

Moss and stone turn this waterfall into an otherworldly liquid veil.

Beer lovers thirsty for knowledge can now visit a museum devoted to the world's largest hop-growing region.

This World War I fortress is the perfect place to catch a Montenegrin sunset.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

A beautiful drive through the foot of the Alps traces the path of 15th-century Turkish raids.

A crumbling World War I fort that is reached through a series of concrete tunnels.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

Hop aboard a charming bog train to explore this rare open-air museum of peat.

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

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

A monument hidden in the woods built in 1938 as a getaway for a Dutch museum curator.

A true Valhalla for cactus and succulent lovers.

A curious collection dedicated to human and animal anatomy and pathology.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

This sprawling Belgian fort was once thought of as impenetrable but now it is simply an abandoned relic.

The highest point in Belgium is a staircase to nowhere.

This ironic war memorial thumbs its nose at a campaign of inedible humanitarian aid food products.

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