Devils Postpile National Monument is located in California, near the eastern Sierra Nevada mountains. It is famous for its unique geological formation of columnar basalt, which was created by volcanic activity around 100,000 years ago. The monument features striking, tall columns that resemble a giant stone organ, making it a popular destination for visitors and nature enthusiasts. The area is also home to diverse wildlife and beautiful landscapes, including the nearby Rainbow Falls. Visitors can enjoy hiking, photography, and exploring the natural beauty of the monument. Established in 1911, it protects both the geological features and the surrounding ecosystem.