From the dramatic grandeur of Yosemite and the alien weirdness of Joshua Tree to the towering trees of Sequoia National Park, ...

Early herdsmen were using a volcanic lava tube to shelter from fierce desert sun at least 7,000 years ago, new research ...

For a unique adventure along the Road to Hana, stop for a self-guided tour of the Hana Lava Tube, which can be found near mile marker 31. It takes no more than 40 minutes to explore about 1/3-mile ...