Castle Gate of "big" 3-height n-wide design working on version 1.8+. It is using buttons to toggle to open / close gate on both sides. This is part of Steampunk Sky City v1.0 for palace main entrance. So, it is special styled and floating design.
Also see 3H Gate Redstone Mockup (h-2.1x) to show how redstone circuit & design working.