A preserved portion of an ancient Athens barrier is displayed in a hotel basement.

The secular incarnation of a religious meditation.

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

One of the greatest collections of coins in the world is housed in the former mansion of an archeological pioneer.

The site where hundreds of Greeks were tortured by the Nazi secret police is now a cosmetics store.

This ancient statue of Dionysus lies unfinished and abandoned in one of Greece's oldest quarries.

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

Scars of this building's past life as a violent prison still cover its walls.

This seaside sanctuary was once one of the most important religious sites for women in ancient Greece.

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

Only a few pieces remain of the structure that carried people and goods across the Thames for some 600 years.

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

The historic tower houses of this nearly abandoned Greek town have been compared to the spikes on an iguana's back.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

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

Learn about the sweet, storied legacy of beekeeping in ancient Greece.

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

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

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

What once sat in the world’s spotlight is today a largely disused ghost complex.

The ghost town where the villagers refuse to leave.

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

An abandoned Byzantine fortress and notorious prison.

Temple complex that once housed the famous statue of Nike.