3 Best Sights in The Southern Sierra, California

Volcanic and glacial forces sculpted this formation of smooth, vertical basalt columns. For a bird's-eye view, take the short, steep trail to the top of a 60-foot cliff. To see the monument's second scenic wonder, Rainbow Falls, hike 2 miles past Devils Postpile. A branch of the San Joaquin River plunges more than 100 feet over a lava ledge here. When the water hits the pool below, sunlight turns the resulting mist into a spray of color. From mid-June to early September, day-use visitors must ride the shuttle bus from the Mammoth Mountain Ski Area to the monument.

Forged by an ancient volcanic eruption, the geological site is a landscape of boiling hot springs, fumaroles, and occasional geysers. Swimming is prohibited—the water can go from warm to boiling in a short time—but you can look down from the parking area into the canyon to view the steaming volcanic features, a very cool sight indeed. You can also hike the foot path along the creek shores. Fly-fishing for trout is popular upstream from the springs.

The glacier-carved sawtooth spires of the Minarets, the remains of an ancient lava flow, are best viewed from the Minaret Vista. Pull off the road, park your car in the visitors' viewing area, and walk along the path, which has interpretive signs explaining the spectacular peaks, ridges, and valleys beyond.