There is a company that creates offspring of famous trees from cuttings from the historic trees.
You can plant a tree that is the offspring of the Elvis Presley Southern Magnolia from the tree at Graceland, the Moon Sycamore grown from seeds taken to the moon and back in 1971 on Apollo XIV, and the Johnny Appleseed tree from the last remaining tree planted by him, which still grows on a farm in Ohio. The Rev. Martin Luther King Jr. spoke in the shade of a Live Oak tree in Selma, Alabama and that tree's offspring is available, and the Live Oak tree growing at the Alamo.
The American Forests Historic Tree Program at www.historictrees.org (800 320-8733) sells these precious trees and many more including the Walden Woods Red Maple and the Gettysburg Address Honey Locust.