Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

A sharp sculpture made of thousands of pieces of jagged glass.

An ancient octagonal weather station named for the eight Greek gods of wind.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This legendary city has been a tourist attraction for centuries.

Monasteries on rock pillars, once accessible only by frayed ropes.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

The shell of a medieval fortress offers commanding views of the area it once protected.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

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

Fantastic stories on a miniature railroad.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

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

The Habsburgs' royal collections of art and wonders.

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

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

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

This town named for the ancient God of War is home to fewer than a thousand people, but it's the birthplace of the Greek Revolution.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

The hallucinogenic center of the ancient world.