Cryptic messages embedded in the New York City sidewalk.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

This neighborhood grocery houses a treasure trove of Eastern European delights.

Visit the monolithic tomb of America's most famous general.

Avoid gangster interaction while window-shopping.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

An artist's cute bronze subway sculptures belie his violent artistic past.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

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

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

Peek through the gates at this oasis from the city, full of Old English charm.

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

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

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

One of the last Jazz Age "Wonder Theaters" in New York City.

A celebration of capitalism in Midtown.

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.

Nikola Tesla's former home contains an homage hidden from plain sight.

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

A very classy 1920s-era bar right in Grand Central Station.