I've been to the Ancient Bristlecone Pine forest in Inyo County, CA where the Methuselah tree lives. Though I didn't get to see that specific tree because the sun was fast setting and I wasn't prepared to hike around in darkness, I had a pretty amazing experience being the presence of 4000- and 5000-year old trees.

While this is interesting and impressive, I kinda relate more to OP's link of more "normal" trees. Going through the list gives me a feeling how many cool trees there are all over the place.