Richat Structure
Let’s stay in the desert for a hot minute (that was a little desert humor for you). Going way north to Mauritania and the more famous Sahara, you can find the Richat Structure. It’s a 30-mile-wide (48-kilometer-wide) concentric ring of rocks that appears to be a signal for aliens to land here. Instead, it’s a dome of rock uplifted by faults that have eroded away over millions of years. Just because it has terrestrial origins doesn’t mean aliens might not use it as a landing spot someday, though.
