The site of the first "historically true" UFO encounter in the U.S.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

This picturesque abandoned home is rumored to be a spite house.

A former connection to City Island, it has been abandoned since the 1930s.

In the middle of suburban Staten Island, a nearly 150-year-old bakery is preserving the art of a disappearing New York treat.

This railroad tunnel was once the longest in Massachusetts.

More than 300,000 historical artifacts from the famous music venue, from Duke Ellington's handwritten score to The Beatles' booking slip.

Underground vaults of a former brewery beneath Brooklyn's Crown Heights are now used to ripen cheese.

This abandoned caretaker's apartment is one of 13 left in the New York Public Library system.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

There must be a pun in this haystack somewhere...

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

This plot of old-growth forest is the largest surviving remnant of New York City's original woodland.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

This small and serene place for quiet reflection on Staten Island was built in China based on the gardens of the Ming Dynasty.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

An eccentric inventor's castle home with its own indoor weather system.

A single room pays homage to the prodigious achievements of the 30th President of the United States.

The former hotel where Tesla invented the radio.

This largely forgotten piece of Cold War history stands hidden in the woods just north of the Mississippi Gulf Coast.

Instead of becoming a power plant, this abandoned complex became a massive letdown.

An eerie and beautiful group of columns mark the site of a grand mansion lost to time and fire.