A vast collection of rare books, manuscripts & extraordinary objects illustrating the history of medicine.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

A museum dedicated to exhibiting remarkable outsider art.

Thousands of locks professing undying devotion line the metal chains of Lotus Peak.

A seemingly endless landscape of pure salt stretches far across Bolivia.

Countless stories attempt to explain Poland's mysterious J-shaped trees.

Terrifying derelict military hospital once housed a recuperating Hitler.

The metal-free wooden towers of Brück.

Started as a kitchen garden, now the second largest botanical garden in the world.

A restaurant and observation deck built in a unique broadcasting antenna.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

An eerie, derelict amusement park in Berlin.

Super-heavy Nazi architectural experiment.

Floating swimming pool within a moored vessel.

Berlin's old airport.

A collection of abandoned typographic signs from Berlin and beyond.

An old department store turned Nazi prison turned artist commune.

A surreal museum of extraordinary industrial objects.

Blitzkrieg bop your way through Berlin's Ramones Museum.

Small museum dedicated to one of the founding fathers of modern astronautics.

The prototype for all Nazi concentration camps.

A morbid secret lies hidden within the beautiful walls of the Boston Athenaeum.

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.