The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Death rituals and sacrifice inside a Peruvian megalith.

These former theme park figures have a new lease on life outside a water plant-turned-restaurant.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

A mysterious stone embedded at the base of a historic Boston building.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

This colorful gate stands as an entrance to the walled city of Old San Juan.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

This small fort played a huge role defending Puerto Rico’s capital city.

This tiny home was originally a narrow alleyway.

The bat-covered home of one of the world's most popular brands of rum is located on a tropical Art Deco campus.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Stolen goods adorn the organ at Old North Church.

The site of Paul Revere's historic two lantern warning.

The oldest working bell set in North America, the bells at Old North Church sat silent for their first four years in Massachusetts.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A technicolor place of worship for Elevationists.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

The fanciest public restroom in New York City boasts fresh flowers, art, and a classical music soundtrack.

One of only two commuter aerial tramways in the United States.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.