The lava tube was found in 1913 by Lorrin Thurston.

From what I understand, these cones are pushed up during eruptions, but lava may not flow out of them.

It was a little moist (blowing mist), but a lot of fun.

The vents emit hot air with moisture. On this moist day it looks
like steam, but the air is just warm to the touch.

The grass is starting to colonize the pumice field.  Once grasses have moved
in, leafy plants start to take over.

The ejected pumice was still hot and burned the trees it came into contact with.
The trees died and left holes in the pumice. The wood is now mostly gone, and many
of the holes have filled in with loose material.