Where commuters walk through remnants of an ancient Greek necropolis.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

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

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

This little-known, 35,000-specimen collection in Greece is a lepidopterist's dream.

An abandoned Byzantine fortress and notorious prison.

These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

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

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

Underground monastery and fortress.

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

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