That would be the South Dakota state capitol. Every year the beautiful state capitol building in Pierre has a display of Christmas trees decorated by various groups around the state. When our girls were younger we took them a couple of times. But I haven't been here for this display in over a dozen years. So I couldn't pass up the opportunity this week to go walk through and enjoy the lights and trees. This isn't the best photo, but I took this from the second floor balconey looking down into the rotunda. It was really beautiful.
Check out the official website to view the trees.