The National Park Foundation is publishing a series of excellent videos they call the "National Parks Epic Challenge".
In the latest video, National Park Rangers descend over Mount Rushmore's enormous mountain sculpture to do preservation work on Lincoln’s face… in other words, to give Old Abe a facelift. The rangers protect Rushmore from erosion, patching cracks and attaching sensors that are connected to strain gauges that monitor rock movement. Mount Rushmore National Memorial in South Dakota was featured in the Hitchcock movie North By Northwest. While the characters in this film appear to climb on the sculpture, in reality only rangers are allowed to do this. Visitors who see Rushmore are inspired by one of the world’s most spectacular works of art:
Rangers Rappel Rushmore: National Parks Epic Challenge from National Park Foundation on Vimeo.
Hiking in Glacier National Park