Spectacular multicolored sandstone cliffs rise 200 feet above lake level and include archways, waterfalls, and sand dunes. Rock formations are naturally sculptured into shallow caves and formations that resemble castle turrets and human faces.
The colors of the cliffs are created by the large amounts of minerals in the rock. Groundwater leaches out of the rock and leaves streaks of color. Iron deposits red color, manganese deposits black-white color, limonite deposits yellow-brown color, and copper deposits pink-green color.
The cliffs are dangerous to canoes and kayaks, etc. Pierre Esprit Radisson, a fur trader in 1658, noted that his Native American companions offered tobacco to the local spirit of the cliffs when they made the risky passage in their birch bark canoes.
The photo below is Miner's Castle, Picture Rocks most famous formation. Historically Miner's Castle included two turrets until 2006 when one of the turrets collapsed into Lake Superior. I remember in the 1970's watching hikers climb out upon the treacherous turrets. If you visit Miner's Castle today there is a short walking trail to a viewing platform and hikers are permitted no further.