Eternal Flame Falls, Shale Creek Preserve, Chestnut Ridge Park, New York City, United States

The Eternal Flame Falls is a small waterfall in the Shale Creek Preserve, a section of the Chestnut Ridge Park in New York. A small grotto at the waterfall's base emits natural gas, which can be lit to produce a small flame.
It was featured in the book Secret Places by Bruce Kershner. In it, Kershner also lays a common local legend—one that claims "elf sightings"—to rest.