Eternal flame. This natural methane vent creates a flame under a waterfall

Chestnut Ridge County Park in New York
The exact coordinates of it are N 42° 42.105 W 078° 45.110
.
Here it is from Google Earth. If you're on a computer Google will put a bunch of user submitted images along the bottom. There are dozens of photos of the phonomenon as well as the other formations, all incredible. Gotta get here some day!
http://bit.ly/1LWYfeY
- FunStats

I thought it was slightly familiar, I've been there! Thirty or forty miles from me. There is another one in East Aurora, NY in Emery Park.

Sometimes they are out from wind or rain. When we were younger we would climb in and light them. I imagine they are all lit by people.