It was one of the last warm weekends of 2016 when I visited the Mammoth National Monument in Waco, Texas. I pulled in around 11 am and one of the tours had already commenced. Each one costs five dollars and the annual National Park Pass I’d purchased a few months earlier wasn’t applicable. Regardless, it was five bucks well spent! I quickly paid for my ticket before running down the path to join the group. The alternative was standing around thirty minutes for the next one. I followed a path down a ravine and found the group sitting on some bleacher stands listening to our guide.