The General Grant Tree. The world's widest known sequoia (40 ft) and third largest by volume (46,600 ft^3). The woman standing on the trail on the other side of the tree gives a sense of the scale. Sequoia Kings Canyon National Park.
Some fun facts:
-If the trunk of the General Grant Tree was a gas tank on a car that got 25 miles per gallon, you could drive around the earth 350 times without refueling.
-If the General Grant Tree's trunk could be filled with sports equipment, it could hold 159,000 basketballs, or more than 37,000,000 ping pong balls.
-The General Grant Tree is the Nation's Christmas Tree (1926) and also a National Shrine (1956).