What can you glean from glancing at a map? If it's a road map, folks will look for routes to their destinations, interesting sidetrips, population centers. Topographical maps can provide rich details of landscapes and help us navigate through them. In this episode fromYosemite Nature Notes, Producer Steven M. Bumgardner, aka Yosemite Steve, introduces us to the map wonders of Yosemite National Park. There's even a cameo appearance by Ken Burns!