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.

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

Step inside an ancient beehive tomb built for a mysterious cult hero.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This 18th-century former mosque held the first Hellenic Parliament.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

Recently restored menagerie of Victorian-era beasts.

The castle still holds traces of the abandoned Roman fort it was built atop.

Vast stretch of tide-pools with a unique Moroccan charm.

An Iron Age hillfort rooted in Arthurian legend was made famous by musician Peter Gabriel.

The walls and streets of the ancient city are peppered with penises.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

Traditional 11th-century outdoor tannery.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.