2 square block factory in Greenpoint erected in 1936.

Once called Winthrop Park in 1889, home to a decidedly sexy tribute to the Monitor vs. Merrimac battle.

Once a dumping spot, now a park with a kayak launch.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

Neoclassical bank designed by NY architects Helmle & Huberty.

The only surviving sidewalk clock in Brooklyn.

This historic tower in the California desert promises visitors a "vortex of good vibes".

A hidden "place of interment for gentlemen."

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

Two rocks in a perpetual kiss and one of "the most romantic spot in America."

North America's largest accredited model railroad museum.

Museum dedicated to the preservation of surf culture.

The Giant Lemon of Lemon Grove.

A collection of more than 12,000 shoes, displayed in a building shaped like a shoebox.

America's most famous piece of self-built architecture.

The ghostly remains of an accidental sea.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

A crumbling hospital from the 1850s on Roosevelt Island.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The first American department store, and home to the largest operating musical instrument in the world.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.