What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

A shining sculpture made of 3,115 lights, the number of visible stars in the Northern Hemisphere.

Take in a rare, face-to-face glimpse of Lady Liberty at this tucked away Red Hook park.

“Invented in Key West, Perfected in Brooklyn."

A graffiti Mecca welcoming artists from around the world.

A once crucial portion of the Long Island railroad still lays abandoned, waiting to be turned into an urban park.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

A semi-scholarly approach to sex.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A wondrous old library overlooking the nation's capital.

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

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

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

A grotesque collection of wax limbs depicting the symptoms of venereal disease.

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

This historic New Orleans cemetery is the final resting place of members of the Independent Order of Odd Fellows.

This sinkhole was created by a tragic industrial accident and continues to ravage the surrounding landscape.

The only home of the famous French impressionist painter open to the public is now a museum and bed and breakfast.

A pink cottage covered in hearts served as a haven and a resting place for LGBTQ activists.

A snapshot of the city's fascinating voodoo culture.

This roadside attraction in the woods of Mississippi is a scalable replica of the Holy Lands during biblical times.

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