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

The house that took a plunge into the facade of a museum.

Physicist’s epitaph provides final confirmation to a career of turmoil.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

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

Dine amidst exotic plants at this former royal greenhouse.

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

This cubist Vienna church building looks like some sort of alien stonehenge.

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

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

Op-art architecture designed for happiness.

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

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

Handsomely crafted representations of our round planet.

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

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

The beautiful baroque library of the Hapsburg empire.

This colorful statue welcomes visitors to a Barcelona park.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

One of Europe's largest supercomputers is housed inside of a disused chapel.

One of the most photographed buildings in a city known for its Modernista architecture is an abandoned squat.

A stately palace has been converted into the world's largest cannabis museum.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.