The former hotel where Tesla invented the radio.

Unrepaired walls from a 1920 anarchist bomb attack.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

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

Cryptic messages embedded in the New York City sidewalk.

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."

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

Plot your trip through the city on the sidewalk.

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

An annual extravaganza of Broadway theater memorabilia.

Avoid gangster interaction while window-shopping.

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.

The oldest living tree in Manhattan comes shrouded in sinister legend.

Wine bottle sculpture with a ship's stateroom inside.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

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

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

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

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.