This Ottoman-era Greek Orthodox Church was built to honor Agia Pareskevi, a Christian saint.

This church combines Christian, Byzantine, and ancient Greek architectural elements.

A series of waterfalls create the illusion of perpetual rainfall in this hidden gorge.

This 11th-century Greek monastery has renowned mosaics and relics of a brutal past.

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

These caves secretly held national treasures during World War II.

Believed to be the only Orthodox church in the world that features a free-standing pulpit.

On top of a hill, this Catholic church overlooks the most Catholic island in Greece.

This Greek Orthodox church houses the mummified body of St. Spyridon.

An intricate network of underground tombs carved into volcanic rock.

Scores of wax baby figurines add an unusual mood to this beautiful church on the Greek coast.

One of the best-preserved medieval streets in Europe.

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

According to legend, this cavern holds the passage that Persephone used to travel to and from the underworld.

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

The ghost town where the villagers refuse to leave.

Temple complex that once housed the famous statue of Nike.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

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

A Byzantine-era church hidden in a wooded area below the Acropolis.

This secret coastal village is studded with pastel-colored houses all piled on top of one another.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

This famous archeological mystery may be an ancient example of movable type.