I looked around a bit, saw a lot of mid to late 19th century graves in the front section of the graveyard, but didn't notice any spaceman graves. Perhaps if you visit the place at night, one of them glows. Still, as with any place of historic significance, it's the state-generated plaque one really came to see, right? Remember the Alamo? They have a plaque. But no basement.
Whaddayaknow if YouTube doesn't have something on this place. In comments, Holly said
"Aurora, Texas" recorded by Allen Damron is a most excellent song telling the
story of the alien ship that crashed into Judge Proctor's windmill.
Couldn't find Mr. Damron's song on YouTube, but I did find this bit: