A mile-long navigable cave adorned with stalactites and stalagmites reaching up to 65 feet tall.

Bizarre dirt trail winds a narrow path above the tree line.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Featured in one of the most iconic scenes in cinema history.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.