the nearby Amboy Volcano. You can read about it here:

https://bouldercityreview.com/sports/crater-at-amboy-picture-perfect-inactive-volcano/

Now that's a great way to get rid of old car tires AND make all six people in town run for their lives. I would not recommend repeating the prank today. The Amboyans have figured it out and burning a tire gets you a hefty environmental disaster fine, if not jail time.