I always thought when a visit to Mount Rushmore would be a walk up, look at it, take a picture and leave event. I was wrong. There are a lot of interesting exhibits about the carving of Mount Rushmore, there are two films (one on carving and one on wildlife), and there are some trails. In the evening there is a lighting ceremony.
We found the exhibits and movie on the carving of Mount Rushmore to be fascinating. It took over 400 people about 17 years and $1,000,000 to build Mount Rushmore. Ninety percent of the carving was done by dynamite. Only the finishing was done using chisels. The sculptor, Gutzon Borglum, built a model 1/12th the actual size. A disk with a rod pinned in the middle of the disk and plumb line hanging from the rod was placed on the head of the president on the model and a corresponding disk was placed on the mountain. Workers would take measurements from the model using this tool and multiply by 12 to transfer the shape to the mountain. They would drill, and place dynamite, during the morning, then set off charges at lunch. They would repeat this in the afternoon and have another explosion before quitting time.
Borglum had to make changes to the model when veins were found in the marble that would compromise the structure of the carvings. Through a window in his studio, he could see progress on the mountain. Next to the window, he had his model.
It is fascinating to watch the videos of the work on the mountain and the dedications by the different presidents as each bust on the mountain was complete. Unfortunately, Borglum did not live to see the final dedication of the completed project.