This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

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

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

This once architecturally advanced housing complex is now a haven for squatters that still bears the scars of war.

This fairytale-looking castle is a wonderful example of Greek neo-Gothic architecture

This beehive tomb built for royalty sat hidden for over 3,000 years.

A solemn reminder of the infamous World War II war crime that massacred almost all the men in a small Greek town.

An islet filled with wooden houses where the open sea meets a lagoon.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

A seaside castle complex that stood through centuries of conquests.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

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

In this town's main square resides a statue of none other than the 43rd President of the United States.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

A World War II-era submarine is stuck in the mud in New Jersey.

Originally built in 1869, this castle is currently part of Felician University's campus.

The remains of a 19th century spring, and the site of an infamous unsolved murder.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A tribute to the hard-working men and women of Grumman, who crafted F-14 fighter jets.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.