It seems YouTube always thinks big and the result is the new support for 4K videos – 4096×2304 resolution.
Man, that’s some serious resolution. As the official YouTube blog states, to see such a movie in its full glory you’ll need a 25 feet (7.62 meters) screen. As a comparison IMAX is projected through 2K resolution projectors and the standard IMAX screen is 22×16.1 meters.
But let’s cut to the chase. Here is the YouTube’s playlist with 4K videos. Be aware you’ll need very fast internet connection, but even then I am still concerned that our screens are no meant for that thing.
To watch the videos in their full resolution, (larger than 1080p), you must select Original from the video quality menu.
YouTube official blog