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Lassen Volcanic National Park, California

Below: Lassen Peak, elevation 10,457 feet, from Lake Helen. This volcano last erupted in 1915. According to the rangers it is currently "resting."



Below: A hot, emerald-colored pond with hot moss on it.



Below: We hiked to Bumpass Hell. A very odd thermal feature with a very odd name, sanctioned by the National Park Service (your tax dollars at work!)



Below: At Bumpass Hell there were loud, steaming vents that smelled like rotten eggs really bad.



Below: There were hot, 240-degree boiling mud pots creating acidic creeks.



Below: One of the eerie-gray acidic creeks running through the beautiful forest.



Below: The sulfur dioxide blowing out of the fumaroles creates pure sulfur crystals on the rocks.