Giant sequoia trees can be found only in the United States, and only in or near the Sierra Mountains in California.
How massive are they? The tree above, with the 6th Cavalry’s F Troop posing on and around it with their horses, is 26 feet in diameter at its base, where it fell, and 285 feet long, Redwood doesn’t rot like other woods. The tree is still there, today, looking much like it did 115 years ago (Comments on Yosemite NP photo).
The Fallen Monarch, in Mariposa Grove, in 1907:
When did the tree fall? Hundreds of years ago, perhaps?
Yosemite NP Nature Notes 11: Big Trees