A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

This famous archeological mystery may be an ancient example of movable type.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

A statue in the center of Dublin dedicated to one of their favorite sons of rock & roll.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

An underground city of salt.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.