A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A crumbling hospital from the 1850s on Roosevelt Island.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

An otherworldly musical haven in The Big Easy.

Legend says a primate-like cryptid prowls this otherworldy sliver of the Louisiana bayou.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

According to one local tradition, the entrance to the Voodoo underworld can be found in New Orleans through seven gates scattered throughout the city's French Quarter.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

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

A former factory serves as a shrine to the industry that sustained Santorini for decades.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

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

Underneath one of the region's most historic roads lies the home of Plato's successor.

The ruins of this ancient fortification wall sit in the middle of a quiet, residential intersection.

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

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

This graffitied 19th-century building was a prototype of European industrial architecture.

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

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

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

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

Where commuters walk through remnants of an ancient Greek necropolis.

Large collection from the 3rd millennium BCE.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.