Bumpass Hell is located in Lassen National Park in northern California. Lassen Peak is the southernmost volcanic peak in the Cascades and errupted in 1914-1917. I visited this strange "otherworld" geothermal sulphur pit last summer. I was impressed with the strange colors, but not the odors. Legend has it a man named "Mr. Bumpass" fell into one of the pits and consequently lost his leg due to severe burns. I didn't want to test this legend myself.