Add Yahoo as a preferred source to see more of our stories on Google. In the series "USA to Z," "CBS Mornings" looks at the history and controversial legacy of Mount Rushmore, which depicts four U.S.

We trace the strange and controversial story behind Mount Rushmore, from its origins on sacred Lakota land to the ambitious vision that transformed it into one of America’s most recognizable monuments ...

Behind the iconic faces of Mount Rushmore lies a hidden room carved into the mountain—a secret dream of its creator, Gutzon Borglum. Meant to preserve America’s founding documents, it remains sealed ...