Very cool, we went on a helicopter tour of Mt. Rushmore last month. It was an awesome addition to the trip as I'm sure yours was. Great pics. That is a gorgeous area!
Lovely spot. So much to see and do. Here's one I took from the helo.
Guessing the sun was shining on the left side there.
Wind from the right keeping the snow there for longer. It's the end of the season so they're not completely covered.