Double spiral staircases are not unheard of, but they are very rare.

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

Terrifically morbid cemetary and site of famous Paracelsus' grave.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Artfully arranged bones of 5,800 Austrians.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

This functional solar system model was inspired by the famous Eisinga Planetarium.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

A crucified and bearded female saint.

Microscopic scenes; some call it novelty, some call it art.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

Two stunning 17th-century libraries and a cabinet of curiosities.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

300 years of pharmaceutical history on display.

An industrial site turned into Hungary's most cherished natural wonder.

Hungarian mummies in beautiful painted coffins.

A forgotten graveyard lost in the tangles of an overgrown garden.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

A Hungarian pharmacy museum with a box full of mummy powder.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.