I’m not exactly sure if Jerome Santucci discovered this interesting phenomenon, or did he just report what he learned. Apparently, if you observe Mount Rushmore from certain point, you can see that four former US presidents aren’t the only ones present.
Anyway, here’s an interesting fact about Mount Rushmore: did you know that the four presidents carved into the granite were initially planned to be depicted from head to waist? Unfortunately, lack of funding forced construction to its end. Either way, the memorial still attracts approximately two million people annually! You can see Gutzon Borglum’s (man behind the idea) original plans by visiting this wikipedia page.