Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

Salute the leader of the proletariat.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

A Manhattan Episcopal church with an eerie underground crypt.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

A way to take your secrets to someone else's grave.

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

In its day this historic fort held 100 cannons pointed in almost every direction to protect New York.

Commemorating the spot where the famous scientist fed his pigeons.

Feral cats keeping the rodent population at bay all across Greenpoint waterfront.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

Where now stands a 42-story condominium tower of marble, glass and steel was once the central market of New York’s slave trade.

The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

There’s a secret bunker inside the Brooklyn Bridge, but the city won’t say where.

A staggering collection of photographs depicting medical, social, and historical change.

A six-story treehouse offers spectacular views of New York's Finger Lakes region.

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

One of only two remaining Victorian-era greenhouses in New York.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

Come for the pastrami, stay for the million-dollar art.

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

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

New York City's only radical feminist independent bookstore.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.