An artistic melting pot inside an old roadside inn from the Ottoman era.

The ruins of an ancient mansion sits in front of and underneath a contemporary art gallery.

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

This graffitied 19th-century building was a prototype of European industrial architecture.

Overlooking the harbor is a beautiful neglected mansion guarded by two Egyptian sphinxes.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

Learn about the sweet, storied legacy of beekeeping in ancient Greece.

This medieval "painted village" is famous for its geometric facades.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

Poseidon? No one seems to know.

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

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

The hallucinogenic center of the ancient world.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

Climb inside an iron crystal magnified 165 billion times its normal size.

Lavish royal estate punctuated with heated greenhouses.

Dummies recreate radiological discoveries from history.

A giant bug impaled on a 75-foot-tall needle.

This whimsical statue dumps water on its head to symbolize knowledge flowing into his brain. Or maybe booze.

This former steel and coal plant is now a neon-lit industrial fantasia.

This collection of solar timekeepers includes the world's first digital sundial.

Housing the groundbreaking maps and globes of Gerard Mercator.