A curious collection dedicated to human and animal anatomy and pathology.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The world's only museum devoted to the wonders of fluorescence.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A former ironworks that was the first UNESCO industrial site.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

This former steel and coal plant is now a neon-lit industrial fantasia.

This German bone house contains the remains of some 20,000 souls.

Retirement home for giant obsolete machines.

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.

A striking 12th-century-style castle built on the edge of a cliff.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

A stairway to heaven, or to nowhere at all.

A German apartment building hosting as many trees as human occupants.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

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

This historic stone bridge has an entire neighborhood clinging to its sides.

Art and a pun, all in one.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.