Declared a National Landmark in 1964, the Casa Malpais ruins are unique in Arizona in that the pueblo, which was constructed around 1250 and occupied until about 1400, was built to take advantage of existing caves. Many of these caves form a system of catacomb-like rooms under the pueblo. To visit the ruin you must take a guided tour, leaving from the Casa Malpais museum in downtown Springerville. At the museum (admission free), you’ll find exhibits on both the Mogollon people and dinosaurs that once roamed this region.