Giant sequoias are the most massive trees on Earth.
They can live up to 3,200 years and reach a girth of 30 feet. While the United states has lost more than half of its original wetlands, California has lost 95 percent. California's most visited national parks include Golden Gate National Recreation Area, Yosemite, Point Reyes National Seashore, Joshua Tree National Park and Death Valley National Park. In 1997, some 22.4 million people visited these five parks. California has the most varied and spectacular state park system in the nation.