An abandoned Byzantine fortress and notorious prison.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

The ghost town where the villagers refuse to leave.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

Poseidon? No one seems to know.

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

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

Hideout of thieves, monks, and goat-footed gods.

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

Two churches shoot bottle rockets at each others' bell towers in an unusual Easter celebration.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.

Giant marble phalluses on the sacred island of antiquity.

Perched on a spindly rock spire in a Greek archipelago, this lighthouse would make a perfect wizard's tower.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

The oldest public library in Ireland.

An ancient neolithic tomb that only sees the sun twice a year.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

An unusual manor of stunning beauty, born out of a crippling disease.