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

The one-time office of the architectural firm that ushered in the Gilded Age is now a Club Monaco.

Cryptic messages embedded in the New York City sidewalk.

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

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

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

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

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

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 sculptural commentary on capitalism pokes up from the East River.

The "Seinfeld" diner.

Elevated freight railway turned wildly successful urban park.

Iron Butterfly's personal collection of footwear.

The cemetery was built for the Spanish colonial elite, but its most famous residents were all buried in unmarked graves.

The once-grand remains of this resort are slowly turning into the strange ruins of the future.

The abandoned medieval theme park was meant to be the "Disneyland of the Philippines."

This historic, palatial theater is now one of the world’s most beautiful bookstores.

A crumbling hospital from the 1850s on Roosevelt Island.