The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The world's first hotel built in an abandoned water-filled quarry.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

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

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

This 19th century cyclorama acts like an analogue time machine to a different era.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

Fantastic stories on a miniature railroad.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The resting place for anonymous victims of the Danube's dark waters.

One of the best collections of wax anatomical models in the world.

The topiary maze at the Habsburg hunting lodge.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

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

Artfully arranged bones of 5,800 Austrians.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

Macabre museum devoted to historical Viennese murders.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.