This beautiful building in the heart of Manhattan's Financial District was empty for decades.

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

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

Oldest surviving example of a Dutch saltbox frame house in America.

A way to take your secrets to someone else's grave.

19th century cemetery hidden in Brooklyn's Prospect Park.

Come for the sustainable organic chocolate, stay for the sustainable organic booze.

Every animal in the torah taxidermied and crammed into a Brooklyn townhouse.

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

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

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

Bowl in splendor, if you're lucky.

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

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

Leaf through over 30,000 artists' sketchbooks in what may be the world's largest collection of doodles