This tree is one of the biggest and oldest in the world, known as "The President" it stands in Sequoia National Park in California. The picture was taken by National Geographic in 2012. THis other picture of the same tree taken in Winter for comparison. When you name a tree it must be for a good reason.
I vaguely remember hiking in Hogsback, Eastern Cape, South Africa as a child to see the "big tree" a few hundred year old yellowwood tree. Beautiful and the biggest in the region. Yellowwoods can age over a thousand years, the tsitsikamma forest near Knysna has some of the best examples - it is unknown how old the oldest ones were that were cut down during the logging in the early days.
I believe this tree is called the "Eastern Monarch" its about half the height of the Sequioa but very impressive.