Mt. St. Helens & Other Volcanoes, Ape Cave ---Lots of pictures, but kind of slow.
Mt. St. Helens --- An excellent site with loads of information about the eruption- lots of before and after pics. Its worth the wait to see those pictures!
Martian Journal---Here's an interesting site. Gus is conducting research
on using lava tube caves as habitation areas on the Moon and on Mars. He's
got a lot of information about lava tubes on Earth as well.