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

"World machine" built by an untrained Austrian farmer.

An exquisite Baroque church in Vienna's old town.

A silly medieval mural preserved on the side of a Viennese house.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

The world's largest collection of intentionally useless inventions.

Legends surround an ancient tree trunk riddled with nails for good luck.

Baroque celebration of the end of the Great Plague of Vienna.

A spherical "micro-nation" in the heart of Vienna.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

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

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.

The final resting place for the remains of 143 Habsburg royalty.

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

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

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

This quaint museum tells about more than just the birth of Jesus: "betlémy" are an important piece of Czech history.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

This Gothic church was wheeled in its entirety to a new location a half a mile away.

A mesmerizing landscape of 18th-century cellars carved out of the land.