Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

"A hideous albatross in the Hudson River Valley."

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

Town full of spiritualists, some of whom are mediums, is still in full swing after 130 years.

The former hotel where Tesla invented the radio.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

Relics given to a Manhattan church to avoid seizure by the Italian government.

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

The famous author's cottage hideaway.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

Once America's longest-manned military fort, now an abandoned hulk.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

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

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

The saddest little diner in New York.

Comprehensive gaming collection of over 30,000 electronic games and consoles.

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

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

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

Lie in a hammock where George Washington stood.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

A popular European tradition makes its way to the states on one of America's most famous bridges.