The world's most delightful not-NOT-religion welcomes visitors to the town of Templin, just like its more stoic peers.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

The home of the morbid art of corpse plastination is open for visitors to view the fascinating, but stomach-churning process.

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

An industrial relic is now one of Europe's most staggering art spaces.

An elevator into the Baltic Sea.

Enter the cabin of a life-sized Hindenburg replica.

Retirement home for giant obsolete machines.

The "Prussian Versailles" that is as glorious today as when it was built.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Art and a pun, all in one.

The fairy tale castle of the "fairy-tale king."

This folk art dinosaur was almost pushed to extinction due to lack of a building permit.

This former Masonic hall has been turned into an art project that uses even more metaphysical iconography.

Bouncing, delightful, mechanical art at the MIT Museum.

An enormous, inside-out glass globe built in 1935.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

The Boston square dedicated to the dark poet who was born nearby.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.