Manhattan's Thirteenth Avenue was made on landfill then deliberately destroyed — apart from one small, obscure block.

A hands-on traveling collection of the innovative devices of yesteryear.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

The most confusing clock in New York.

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

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

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

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

The 28-foot granite map plots the locations of 40 theaters in New York City.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A semi-scholarly approach to sex.

A whimsical, but often overlooked clock in Park Avenue.

The notorious headquarters of a corrupt political machine.

Haven for steampunks.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

A dilapidated dock tells the story of Titanic's missed arrival.

Tucked in the back of this amazing antique store is an important piece of medical history.

This block in downtown Brooklyn was a hotbed of antislavery activism along the Underground Railroad.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

The site where Joe Gallo kept his guns, pet lion, and launched an all out mob war in 1960s Brooklyn.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

Retribution for death of infamous mob boss Franie Yale was a case of mistaken identity.