This Luxembourg cave is covered in cryptic looking marks left by mining activity.

An unusual sand beach in the middle of a forest.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

A ruined castle stands atop a hill surrounded by dragon lore.

Thousands of flowers create enchanting pink tunnels over the city streets.

A pair of giant stone heads represent the ancient Roman saints beheaded here.