40. Redwood National and State Parks – California
If you want to see some of the oldest living trees in the world, you’ll want to visit the Redwood National and State Parks located in California. It is so big that it encompasses three state parks and is 139,000 acres (via Oyster). The oldest living residents are redwood trees, as old as 700 years old, with trunks about 20 feet around. Like all national parks, it is recommended that you don’t damage the trees in any way and carry your garbage out with you (via Oyster).