No one knows who built this strange cave of worship or exactly why.

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.

An abandoned horticulture institute gloomily presides over rows of derelict and vine-wrought greenhouses.

Series of storm drains connected to a dark urban legend.

Read a book next to a Midtown waterfall.

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

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

A quiet and contemplative oasis in the middle of New York's bustle and riot.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.