Hoover (Boulder) Dam and Grand Canyon Nt'l Park - 3 ViewMaster Classic Vintage 3D Reels - Produced in Portland, Oregon during the early 1950s, these 3 reels retain their vibrant colors. They are very gently used Reels are: 11 - Hoover (Boulder) Dam, Nevada USa 26 - Grand Canyon National Park, South Rim I - Arizona USA 27 - Grand Canyon National Park, South Rim II - Arizona USA What a way to view the world - in 3D. Yes, View-Master images are in 3D and that's what makes them so real. You will need-Master viewer to view the 3D images - available here on Amazon Each comes with its own white sleeve.