close-up view of mt. rushmore, featuring the faces of four famous u.s. presidents carved into the mountainside

abraham lincoln american culture black hills carving craft product clear sky cliff custer state park famous place fourth july geology george washington granite rock head hill horizontal human face independence concept international landmark keystone south dakota landscape scenery memorial monument mountain mt rushmore national people outdoors patriotism president presidents day object scenics nature sculpture statue stone material summer sunny theodore roosevelt us thomas jefferson tourism travel destinations usa vacations history