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

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

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

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

The ancient latrines of the Greeks, in all their public glory.

Nassau Hall has served as army barracks, a museum, and played a key role in the American Revolution.

The mysterious canine hides atop a drain pipe on the back of the building, some say as a sneaky shoutout to Yale.

Housed in an old British jail, this spot serves up Georgian, Russian, and Ukrainian specialities with a side of Turkish history.

Ancient serpentine sacrifice holder that has stood the test of time.

Large miniature theme park with 100-plus models.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

A "miracle" that seems to produce more holy fistfights than holy revelations.

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

340-foot statue built to honour the Heroes of the Soviet Union.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

This fountain pays homage to Qatar's history of pearling, the primary industry before oil.

This derelict superstructure was a very important warning system for the Soviet military.

The dining hall that nourishes workers in Chernobyl's Exclusion Zone is also open to visitors.