At years old, this ancient bristlecone pine is the oldest known non-clonal organism on Earth. Located in the White Mountains of California, in Inyo National Forest, Methuselah’s exact location is kept a close.
We have these in Australia too. It's a 'Strangler Fig', that envelopes an existing tree. Eventually, is impossible for the tree to survive and it dies. The original tree will rot completely away and the Strangler Fig is left as a lattice work hollow tube.
The Dyerville Giant, one of the largest trees in the world. When this massive tree crashed to the ground in you could hear it for miles around. It sounded like a train wreck. ("Avenue of the Giants," Humboldt Redwoods State Park, California)