Mount Rushmore Construction Pictures: History, Facts, & Trivia About When It Was Finished

The Mount Rushmore National Memorial in Keystone, South Dakota was carved into granite in the Black Hills. Ninety percent of the carving involved the use of dynamite. Source: (Photo by Patrick Gorski/NurPhoto via Getty images.)

On October 31, 1941, construction on Mount Rushmore wrapped up after 14 years of work. The giant carved mountain in the Black Hills of South Dakota, just outside the town of Keystone, has become a symbol of America and an attraction that welcomes more than three million visitors through its gates each year. Here are some fun and interesting facts about the Mount Rushmore construction process.