This seaside sanctuary was once one of the most important religious sites for women in ancient Greece.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

Step inside an ancient beehive tomb built for a mysterious cult hero.

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

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

This famous archeological mystery may be an ancient example of movable type.

Where commuters walk through remnants of an ancient Greek necropolis.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Temple complex that once housed the famous statue of Nike.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

Large collection from the 3rd millennium BCE.

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

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

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.

Giant marble phalluses on the sacred island of antiquity.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

A place for ship-lovers to watch the passage of freighters traversing the Great Lakes while learning about their history.

Over 60 chemical plants and oil refineries sit in a 15-mile-wide section outside town.

It looks like a whale, it's part of Yale, and it's best-known by a nickname you can probably work out for yourself.

An extra-wide chair built to accommodate the former president's big behind.