Yellowstone National Park, Pkt. 1 - 3 ViewMaster reels - 21 3D Images Discover the magic of 3D View-Master reels. These reels offer a nostalgic viewing experience of 1960s Yellowstone... Simply insert the reels into a 3D viewer to immerse yourself in the timeless vibrant 3D imagery You will need a ViewMaster viewer to see the 3D images, available here on Amazon Yellowstone Set 1 3-Reel set includes 3 reels with seven 3D stereo images per reel. This 3D Tour is a timeless gift with universal appeal among young and old alike.