This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

This modern, multimedia museum takes visitors on an evolutionary journey back in time.

This beautiful Croatian fortress is haunted by legends of forbidden love.

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

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

An ornate private entrance to the Vienna subway built specifically for the emperor.

The topiary maze at the Habsburg hunting lodge.

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

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

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

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

Dine amidst exotic plants at this former royal greenhouse.

Handsomely crafted representations of our round planet.

The Habsburgs' royal collections of art and wonders.

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

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

Op-art architecture designed for happiness.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

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

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

The site of Austria's biggest concentration camp now honors its victims.

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

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

A road runs through the middle of this small Austrian chapel.