Great movie, some was filmed in my backyard:
Didn't know that about film sets/locations for CLOSE ENCOUNTERS. If you've ever actually been there at the devils tower you know how SMALL it is, and just an asphalt walkway around it. My father was born in Hulitt, WY; just a stone's throw away. There is another similar volcanic spire in the area but it isn't as prominent as the devil's tower.