Giant, pink stuffed rabbit on an Italian mountain.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

Natural cathedral designed by Italian artist Giuliano Mauri.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

A market built atop boats is one of the few floating holiday markets in Europe.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

Moorish signal station on a stratgic rocky outcrop.

A Romanesque tower appears when water levels drop.

Cursed swimming pool left abandoned is now a favorite of filmmakers and ghost hunters.

This massive fiberglass Gulliver turns every visitor into a Lilliputian.

Of course Salvador Dalí lived in a castle...

Stunning Roman aqueduct used for 1900 years and still standing.

A completely underwater art museum sends a stark message about humans' impact on the environment.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

The world's largest wooden structure.

Cliffside houses provide a spectacular view from their perch above the valley.

A landscape decorated with enormous skull sculptures.

A Spanish forest is filled with mysterious stone carvings.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Bacteria and algae give the salty water its bubblegum hue.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

Two gravestones clasp hands over the religious divide.