The lunar module flown on Apollo 10 is the only flown lunar module which didn't end up crashing into the moon, or burning up in the Earth's atmosphere. After the testing in lunar orbit the ascent engine performed a burn to depletion which meant it escaped into interplanetary space. At this moment the location is unknown, but people are looking for it, however it could take decades to be sure since it only comes into the vicinity of the Earth every 15 years or so. If it were found however, would it be possible to bring it back to earth for inspection by historians and space archaeologists - time to fire up Kerbal Space Program with realism overhaul to try flying this mission. Mike Loucks' did the math to figure out the possible orbits: https://astrogatorsguild.com/?p=240