An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

This innocent-looking townhome is actually a subway exit.

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

The most radioactive spot in New York City can also fix your muffler.

This small, hidden cove is home to abandoned boats.

The remains of a failed subway in upstate New York is now an underground graffiti bunker.

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A former connection to City Island, it has been abandoned since the 1930s.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

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

This former Norwegian sailor's church is slowly being taken over by ramshackle robot musicians.