Welcome to The Bunkhouse at Old Man Mountain, Castle Mtn. studio, a well designed efficient space for 1 guest or a couple looking for great access to Rocky Mountain National Park and the village of Estes Park. The red-metal roofed-cabin was designed by our father, an architect who studied under Frank Lloyd Wright. Castle Mountain studio is a (380 sq. ft.) studio suite with contemporary / western décor. It was named after the mountain view out the large picture window.