Given the scale of what once was, it wouldn’t be difficult to call the place “Siouxland's biggest fossil,” a sprawling, endless petrifaction. Walk out the door of the lobby, keep the walls on your left and circle the entire place--it'll take you the better part of a half hour because the place is gargantuan.
A century ago, it had to have been perfectly colossal because 116 years later it still is. If you've never seen it, drive up sometime. It’ll stop you in your tracks.