Yosemite National Park Travel Guide. Yosemite is a cathedral of granite walls and thundering waterfalls where ancient sequoias stand guard and high meadows offer quiet refuge beneath the Sierra sky.

Lassen Volcanic National Park in Northern California is one of the few places on Earth where all four types of volcanoes can be found in a single region. Steaming fumaroles, boiling mudpots, and clear mountain lakes dot its wild landscape. The park centers on Lassen Peak, the world's largest plug-dome volcano, which last erupted from 1914 to 1917. Visitors can explore forests, wildflower meadows, and hydrothermal areas in relative solitude.