Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

This crumbling little graveyard was saved from the undergrowth by concerned veterans.

Depression-era fun lives on in this Harlem museum dedicated to the sport of the street.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

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

The highest point on the island known for buildings that touch the sky.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

Self-sufficient greenhouse floating on the Hudson River.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

Astonishing collection of helmets, scientific instruments, and medical models.