America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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

A layered tribute to the work of mosaicist Isaiah Zagar.

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

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.

Cheap pizza and all of your naughty bedroom needs housed in a stunning example of Art Nouveau architecture.

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

Read a book next to a Midtown waterfall.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

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

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

The former hotel where Tesla invented the radio.

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

On the Hudson resides one of the largest clocks in the world.

A modern zoetrope on the New York City subway.

Michael Jackson got Bad and Crocodile Dundee walked on heads in this iconic Brooklyn subway station.

The oldest operating apothecary in the US has treated everyone from Thomas Edison to Mark Twain.

Monument to a forgotten NYC disaster that claimed the lives of 1,000.

The site of the deadly Triangle Shirtwaist Factory Fire.

Red frames showcase remnants of one of New York's original subway stations.

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

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

Try not to get slimed in Tribeca.

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