There are three groves of old growth giant sequoias in Yosemite National Park. The most famous is the Mariposa Grove, to the south, but there is also the Tuolomne and the Merced. I hiked around the Tuolomne Grove when I visited. Such wondrous things, the big trees! It is amazing that a seed the size of a fingernail can turn into a tree the size of ten blue whales. And though only a fraction of them remain, the old growth Giant Sequoias are arguably the largest living organisms on Earth (though some would argue for Pando and some for a giant fungus).