Gladiators once walked this ancient, subterranean passage.

A dark, narrow tunnel that leads to a charming lake and waterfall.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

This medieval "painted village" is famous for its geometric facades.

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

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Giant marble phalluses on the sacred island of antiquity.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

Legend says this sacred tree was a gift from goddess Athena.

The hallucinogenic center of the ancient world.

A luxuriant botanical garden below sea level.

Taste the white whiskey that the United States' first president once distilled and enjoyed.

The inventor of a number of hybrid corn species is immortalized with a field of giant corn.

Remnants of a storybook amusement park hidden behind a strip mall.

This 16th-century mosque is the hallmark of the African architectural legacy in India.

Time has stopped at the house where Gandhi died.

An ancient iron pillar in Delhi that seems to be rustproof.

A blooming house of worship for the masses.

This experimental utopian "city of the future" in rural India may hold a dark secret.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.