This outdoor gallery of sculptures along the East River was once a landfill.

No monkeying around, this fountain was really named after the classic sci-fi film.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This hidden oasis features a stunning view of the Hudson River and the Palisades from a castle-like museum.

A tribute to the hard-working men and women of Grumman, who crafted F-14 fighter jets.

A large camera obscura, constructed entirely from digitally fabricated components.

A restored Shell gas station from 1937 that includes a tow truck, the original gas pumps, and the original office.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

One of the U.S. Forest Service's only mansions is outfitted with a dinner table for floating food.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

A winding, cliffside stretch of road overlooking the Delaware River.

This jail which was in service for over a century is now open for curious visitors.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A former seaside jewel built for the everyman is now simply a neglected art deco fortress.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

This outdoor gallery of graffiti-covered walls pays homage to the past, present, and possible future of street art.

The famed amusement district marks the beginning of summer with a wild procession of nautical creatures.

The flagship building of an early national restaurant chain is a superb example of terra cotta art.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

This 19th-century Hamptons windmill was once home to modernist painter Agnes Pelton.

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

Mrs. Mallard and her brood are a beloved fixture in Boston Public Garden.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

The last standing puppet theater on Long Island.