The spectacular and eerie moss-covered grave site of 19th-century Belgian merchant.

An extensive network of secret tunnels was created for the Nazi project "Riese."

Order a salt beef-loaded beigel at any hour of the day or night at this East End institution.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

This third-generation institution is one of the last in London that still cures its own salt beef for epic sandwiches.

A huge Soviet-era robotics factory in the outskirts of Pripyat, now long-abandoned.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

A unique collection of Soviet military artifacts lies hidden away in a disused train, in the unrecognized Eastern European republic of Transnistria.

A statue dedicated to the founders of communism.

Executed in 1401, Exhumed in 1878, Stolen in 2010.

This abandoned prison was so notorious that its name has become a metaphor throughout Albania.

Because holiday cheer is at its finest when it includes eerie mannequins, right?

On a former island, this old fortification once used to protect the Boston Area and started Edgar Allan Poe in his military career.

Around 160 years ago, this spot marked the location of a wharf along the shores of the Charles River.

The strikingly modern structure stands out among the brick buildings speckling the Harvard Business School's campus.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

A museum dedicated to secret surveillance.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

The oldest Roman lighthouse still in use.

Once a major stop on the Hejaz Railway, this desert station (complete with steam locomotive) has been abandoned for decades.

Elegant marble and old vaults fill this historic Dutch bank turned office space.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

A road runs through the middle of this small Austrian chapel.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.