The "Giant Grizzley" Sequia tree in Mariposa Grove inside Yosemite National Park in California November 24, 2008. The tree is 3,000 years old and is one of the largest and oldest living things on Earth. The tree is 3,000 years old and is one of the largest living things on Earth. The tree is 100 feet around at the base with a diameter of 29 feet and is 209 feet high. It is the largest tree in Yosemite and is believed to be the 5th largest tree on earth, weighing 2 million pounds and comprising 30,000 cubic feet of lumber, enough to build some 20 homes. Its lowest limbs are 6 feet across. (Photo Copyright Alan Greth)