This beautiful 150-year-old synagogue survived Italy's fascist period and the Second World War.

The largest catacomb system in the world.

A collection of miniature, symbolic sculptures hides in plain sight across Kyiv.

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.

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

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

One of the most poignant ruins of the Chernobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

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

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

The ruined doorway is a portal to the building's turbulent and torturous past.

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

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Where commuters walk through remnants of an ancient Greek necropolis.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

An ancient octagonal weather station named for the eight Greek gods of wind.

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

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

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

An Art Nouveau building covered in animal gargoyles and grotesques.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

This legendary city has been a tourist attraction for centuries.