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

A 19th-century politician who died after walking home in a blizzard is honored with this Manhattan statue.

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

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

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

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

This taxidermy scene brings the struggle for survival in the Indian jungle to a quiet corner of a Manhattan museum.

This poignant display is now a memorial to these regionally extinct species.

An eerie diorama that captures the majestic nature of a few prehistoric-looking beasts.

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

The scars of World War II are preserved on its walls.

This century-old cinema house has a marquee that has been hand painted by a single man for over 25 years.

One man's personal kunstkammer, museum and shop.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

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

This landmark building is now a vibrant performing arts space with musical acts from around the world.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

Resonating tubes make music from highway overpass.

More than 200 unconventional musical instruments that anyone can play.

This sprawling 18th-century cemetery features unique and beautiful gravestones, including one shaped like a tree.

This abandoned neighborhood is now a park filled with beautiful trees, wildflowers, and hints of its past.

New York's southernmost subway station is whimsically wavy.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.