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

The former hotel where Tesla invented the radio.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

New York City's only radical feminist independent bookstore.

New York City's only preserved family home from the 19th century.

The first museum in the United States dedicated entirely to posters.

Cryptic messages embedded in the New York City sidewalk.

A discreet little stairway on St. Nicholas Avenue leads to a quaint and unexpected cobblestone street of 19th century wooden rowhouses.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

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

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

Plot your trip through the city on the sidewalk.

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

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

An annual extravaganza of Broadway theater memorabilia.

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

An artist's cute bronze subway sculptures belie his violent artistic past.

Wine bottle sculpture with a ship's stateroom inside.

Finally, you don't have to be a pious Swedish seaman to relax like one.

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

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

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.