'Door to Hell' Still Burning, 42 Years Later - Scientists set it afire in 1971, expecting brief blaze

'Door to Hell' Still Burning, 42 Years Later - Scientists set it afire in 1971, expecting brief blaze: "(NEWSER) – Locals call it the “Door to Hell.” Scientists expected this 230-foot-wide crater to burn out a few hours after the fire was started. That was in 1971. The flames have been blazing for more than 40 years."