Bicentennial Moon Tree
Flagstaff, Arizona
The idea of Moon Trees, trees grown on Earth from seeds carried on Apollo flights to the Moon, germinated in Flagstaff, which at the time was a center for astronaut training. That makes the "Bicentennial Moon Tree" in Flagstaff -- planted on April 30, 1976, according to its sign -- an extra-special member of an already exclusive club.
However, according to a story in the Arizona Daily Star, this Bicentennial Moon Tree never went to the Moon. The real Moon Tree was uprooted and killed by some jerk only three days after it was planted, apparently a victim of 1976 Flagstaff politics (Some saw it as a symbol of artsy-fartsy tree-huggery).
The Moon Tree was then immediately, and secretly, replaced by a near-identical Earth spruce tree.
The supporters of the Bicentennial Moon Tree point out that the replacement was never noticed, and that the tree has, over the decades, grown in the fragments and soil of the real Moon Tree, which makes it at least a little bit Lunar. We feel that the real value is in the sign, which continues to enlighten new generations who otherwise would have never heard of Moon Trees or the Bicentennial, even though it admits that the current tree only "represents" the original.