The caves are part of Pictograph Cave State Park, which features paved trails to the caves with interpretive signs about the paintings, the area's geology and vegetation. The park encompasses and includes a visitor center and picnic facilities. The natural shelters are nestled in a sandstone bluff on a well-traversed path extending south from the confluence of Bitter Creek and the Yellowstone River, south of Billings. The cave complex has long been a site of mystical power, a culturally significant gathering place for American Indians. On the interior wall of Pictograph Cave (the only one containing rock art), archaeologists discovered 106 pictographs, painted between 2,145 and 200 years ago. The walls were covered with red, white, and occasionally yellow figurines over drawings originally painted with black. They also found stone and bone tools, moccasins, arrow shafts, basketry, grinding stones, and fire-starting tools. Excavations turned up jewelry too, such as pendants, bracelets, and beads crafted of seashells acquired from Pacific Coast Indians. The excavation was led by H. Melville Sayre of the Montana School of Mines. He later hired Oscar Lewis, an archeologist from the Glendive WPA crew, to help supervise the dig.
William Mulloy replaced Sayre as the Project director from Oct. 1940 to Feb. 1942. ==Development and perception of the site==