This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

This "floating railway" is one of the world's oldest monorail systems.

Tucked away in a small German apartment is an eclectic museum devoted to West African vodun culture.

This monolithic slab of art metal crowns a German slag heap.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.