I recently made it out to the Devils Postpile, and here’s what I have to report: it is indeed something you need to see. My former boss was right: this is an area that is remote and lesser known than its bigger cousin, Yosemite. I say “lesser known” because I am well aware that it is directly outside of Mammoth. This is not something that should dissuade you from visiting: even though it is directly outside of Mammoth, it is still tucked away in its own corner of the Eastern Sierra. Also, in this case, being tucked away next to Mammoth is a good thing: there are well signed parking areas for the park from which you will take a shuttle into the park during the summer months. While Devils Postpile is named for the amazing geologic feature of the park – the columnar basalt “piles” that formed over one hundred thousand years ago from cooling lava, and the basalt is amazing to see, I think the best day hike in the park is the hike to Rainbow Falls.