Mt. Rushmore Cave is famous mainly because of its location a few miles from the Mt. Rushmore National Monument. Certainly the cave relies on visitors from Mt. Rushmore, but is really is a pleasant and extremely interesting cavern. One of the most spectacular features of Mt. Rushmore Cave is the Big Room.

Like many caves in the Black Hills of South Dakota, miners following the ore veins discovered this cave. The geological landscape of the Black Hills is unique, as the pahasapa limestone contains various interesting ore veins caused by the granite of Mt. Rushmore. The minerals and ores, corroded and oxidized by the water, produce fascinating colorful limestone formations.