As our plane touches down in Sundsvall, Sweden, the horizon is all snow and ice. A small air traffic control tower sticks out above the white horizon.
But this airport actually has two air traffic control centers. The second one is just a short walk from the airport runway.
Inside a ground-floor, windowless room, there's a display that looks exactly like what you'd see out of an air traffic control tower. You can see the snowy runway, you can see the trees, you can even see a car pulling into the airport parking lot.
But instead of windows, these are actually screens.