An annual extravaganza of Broadway theater memorabilia.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

"A hideous albatross in the Hudson River Valley."

The mummified relics of an American missionary.

The most confusing clock in New York.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

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

The famous author's cottage hideaway.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A whimsical, but often overlooked clock in Park Avenue.

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

The site of a tragic massacre that spawned a multimedia franchise.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Lie in a hammock where George Washington stood.

Walk over a 150 year old manhole.

One of the last Jazz Age "Wonder Theaters" in New York City.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

One of only two commuter aerial tramways in the United States.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.