1. The moon rocks, totally unlike anything ever found on Earth, and there are a few hundred kilograms around the world that have been examined by thousands of geolgists (not just the NASA paid geologists).
2. You can see some of the Apollo sites using the Hubble telescope
3. The laser cube reflecetor experiment. A few of the Apollo missions left behind a tray of mirrored cubes (with the top face open). These cubes are designed to havethe proerty of reflecting back light in the same direction that it came from no matter what the angle.
Hundreds of astronomers around the world (not just NASA paid ones) have used this to exactly measure the distance to the moon.
