The top of the holy mountain for the ancient Spartans looks like a pyramid—is it man-made or a natural phenomenon?

The world's most important buildings shrunk to a tiny size.

A magical, if a bit tacky, 1960s castle conjures up medieval fairytales and Greek mythology.

The Greek island's old British cemetery feels like a forgotten garden.

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.

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

Where commuters walk through remnants of an ancient Greek necropolis.

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

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

Legend says this sacred tree was a gift from goddess Athena.

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

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

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

The hallucinogenic center of the ancient world.

Britain's answer to the NSA is based out of this deliciously-named circular headquarters.

A rampant horde of demons smirk and snarl at visitors to this church, home to a rare complete set of medieval-era stained glass windows.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

A miniature village mimics the surrounding buildings so well it includes itself.

Banksy's image of a naked man dangling from the window of a sex health clinic.

This gate served as a small lock-up jail in the 14th century.

The oldest working mechanical clock in the world.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

An icon of the Battle of Britain is frozen in flight in a grand Victorian museum.