Lassen Volcanic National Park is located in north-central California. It's a very large park containing the remnants of all four types of volcanoes. Mt Lassen last erupted in 1914-16 with the largest eruption in May, 1915.

There are a number of bubbling mud pots along with a "boiling" lake and some steam geysers. The devastation caused by all these volcanoes is still very evident throughout the park. Perhaps the most fascinating area is the Cinder Cone area which is the scene of a volcano eruption (circa 1650) that created a large conical pile of granulated cinder 750 feet high. There is a path up the periphery of the cone allowing hikers to make a tough, steep climb over loose scoria (top rim of the cone is about 900 feet above the trail head). The eruption spewed lava rock over an area or 30 square miles and appears to be in excess of 60 feet thick in some areas.

This lesser known park is a hiker's paradise, with over 150 miles of trails. However, due to the high elevations, many trails (and even the roads) are only open during the Summer months.