America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

An Irish Memorial commemorating those who perished due to potato blight.

This elaborate towering structure was once famed for its revolutionary height.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

The abandoned coal loading dock is a canvas for unsanctioned art.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A wooden rollercoaster that still delivers a thrill.

Final resting place of two dozen New York City harbor ships.

Rummage through this sunken ship, but leave your scuba gear at home.

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

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

Avoid gangster interaction while window-shopping.

Once America's longest-manned military fort, now an abandoned hulk.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

The "Seinfeld" diner.

Order scoops of pandan, lychee, and black sesame at this family-run institution.