Devil's Postpile National Monument is located in eastern California, near the town of Mammoth Lakes. 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 vertical columns that rise up to 60 feet high, making it a popular destination for visitors interested in geology and natural beauty. The monument also includes the scenic Rainbow Falls, which cascades 101 feet into the San Joaquin River. Established in 1911, Devil's Postpile protects this natural wonder and offers various recreational activities, including hiking, camping, and photography, attracting nature enthusiasts year-round.