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

The only surviving sidewalk clock in Brooklyn.

Dedicated to the humanitarian efforts of the state's former governor.

This 19th century Sioux City candy company is the home of the Twin Bing, a historic, chocolate-covered treat.

America's first National Historic Landmark is a 100-foot tall obelisk and gravesite dedicated to the only casualty of the Lewis & Clark Expedition.

Once forgotten, this strip of sand was a rare beachside haven for Black Americans in Atlantic City.

The only subway station in the city that still makes use of gap fillers.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

Behind a grungy bodega facade, a Poblano family serves rich, home-cooked meals.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

Try not to get slimed in Tribeca.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

The oldest living tree in Manhattan comes shrouded in sinister legend.

New York City's smallest piece of private property.

The most confusing clock in New York.

This 220-year-old house is a reminder of New York City's Dutch past.

A reminder to choose water over wine since 1888.