One of the only single-person private gravesites in New York City.

Need to book a room at the Hotel Pennsylvania? Just dial up 6-5000.

This abandoned subway station can still be seen on regular commuter trips.

The notorious headquarters of a corrupt political machine.

Nope, not Washington Irving's house.

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

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

Storage warehouse of the rich and famous.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

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

A simple midtown bar was once the home of a secretive and exclusive club staffed by "bunnies" under Hefner's strict rules.

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.

A Manhattan office building is home to the world's largest chess board.

New York City's first Modernist house.

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

Rat sculptures try to infiltrate the Graybar Building in an architectural tribute to New York City's nautical history.

Join in a Seance at the Swedenborgian Church.

A replica of a 7th-century church hides in plain sight in the middle of the concrete jungle.

A whimsical, but often overlooked clock in Park Avenue.

America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

This Manhattan skyscraper is a reminder of the brief but glorious age of urban air taxis.

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

Twenty-three trees, each paired with a basalt stone, line a street in Chelsea, continuing an urban project started by German Fluxus artist Joseph Beuys.