The oldest wind turbine in Europe, constructed by a group of friends in 1932.

A monument to Poland's famous alleged UFO abduction case.

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

The industrial monstrosity known as Bagger 258 is a colossal mining machine built in the DDR - but now left for dead in a German field.

The most visited, and possibly most controversial, museum in Germany.

Super-heavy Nazi architectural experiment.

An eerie, derelict amusement park in Berlin.

Private collection of art inspired by cabinets of curiosity.

Successful artist residence program has filled this ranch with dozens of sculptures over the years.

Subterranean house made out of a grain silo, located in the Santa Cruz Mountains.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

Rodin's famous depiction of Dante's 'Inferno', amidst a sculpture garden of many of his other works.

A sudden forest of traditional Papua New Guinean art works is hidden in a corner of Stanford University.

Guarded by the Angel of Grief, the Stanford family tomb attracts an odd mix of halloween revelry and somber contemplation.