The next stop on my Memorial Day road trip was Lava Beds National Forest. Offering everything from snug lava tubes, to giant galleries, ancient ice and lava fields, Lava Beds National Monument is an amazing place.
A short drive from Lassen Volcanic National Park is the Subway Cave, in Lassen National Forest. Subway Cave is actually a lava tube, formed about 20,000 years ago. It’s also a great place to cool off and explore.