A natural gas leak provides a flickering flame beneath a waterfall.

Surprisingly aquamarine waters fill deep lakes formed at the end of the last ice age.

A winding, cliffside stretch of road overlooking the Delaware River.

This evocatively named natural crevasse was created by a torrent of water that smashed right through a granite deposit.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.