A surprisingly beautiful abandoned World War II military base in East Greenland.

The 3.8 billion-year-old rock proves that tectonic plates may have been shifting longer than we thought.

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

Flying high over the small island of Zákynthos is a giant tribute to the mainland.

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

This 200-meter-high waterfall marks the site of Achilles’s immortal baptism at the mouth of the River Styx.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

Once the largest rope factory in Greece, this abandoned plant now stands like a ghost of industry past.

These sea caves are the source of Xigia Beach's distinct aroma.

The partially submerged ruins of a white marble quarry used in ancient Greece for over 1,200 years.

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

A miniature desert appears out of nowhere on the lush isle of Lemnos, like something out of a Greek myth.

Every spring, locals see the shadowy figures of a ghost army of slain Greek soldiers descend upon this ruined fort.

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

The rocky remains of an ancient Greek forest.

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.

A little-known park with unusual, half-ruined structures and a mystical energy.

An abandoned Byzantine fortress and notorious prison.

An ambiguous ambience emanates from this centuries old leprosy quarantine.

This wrecked ghost ship has been rusting on a Greek beach since the 1980s.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

This abandoned Greek island was the last active leper colony in Europe.

Poseidon? No one seems to know.