I left Arizona on Sunday, half-safe after my first Covid shot, and headed east to Monument Valley in Southern Utah. If you haven’t been to Monument Valley, you’ve probably seen it in films. It was first featured in “Stagecoach,” 1939, with John Wayne. Since then, the Valley’s spectacular sandstone formations have been the setting for more than a dozen classics, including “Thelma and Louise” and “Forest Gump.”