This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

It was once nicknamed "the most bombed hotel in Europe."

The ruins of the castle that chemicals built.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

An eccentric folk art landmark made out of discarded bottles by an inspired "grandma."