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

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

The smallest island in Manhattan is a manmade landfill dominated by a Buddhist peace arch.

A staggering collection of photographs depicting medical, social, and historical change.

This semi-hidden Manhattan restaurant is based out of a loading dock.

There must be a pun in this haystack somewhere...

Commemorating the spot where the famous scientist fed his pigeons.

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

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

An unassuming secret door once led to a legendary watering hole.

This study room in the New York Public Library saw the creation of one of contemporary America's greatest traitors.

The former home of the reclusive "Weird Wendels" who dominated New York real estate a century before Donald Trump.

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

Hundreds of antique bank vault locks on display in New York City.

This was one of the first (and last) university-built and operated nuclear reactors.

Depression-era fun lives on in this Harlem museum dedicated to the sport of the street.

A crumbling hospital from the 1850s on Roosevelt Island.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

The "Seinfeld" diner.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

Read a book next to a Midtown waterfall.