This facility, now a museum, once housed and trained U.S. Army Air Force pilots who flew during the Allied invasion of Normandy.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

A historic recreation of the golden age of the Erie Canal, abandoned for some time, slowly being restored.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.

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

This abandoned subway station can still be seen on regular commuter trips.

Reforestation in action is the main attraction in this abandoned quarry.

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

The remains of what was once the world's steepest passenger funicular.

This small, hidden cove is home to abandoned boats.