A castle built for love, and abandoned due to heartbreak.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The only museum with its curator—and her pets—buried inside.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Where Venice's gondolas go for a tune-up.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

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

This former insane asylum now holds a pathological anatomy museum.

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

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

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

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

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

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

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

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

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

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

Why have you never heard of the second most popular tourist site in New York?

This giant monument of the RCA mascot is a beloved fixture in Albany, New York.