Salt-sand dome, O'Hare Airport, Chicago

I've always loved these "winter domes," which you see scattered all around the snowy states, holding heaps of sand or salt to be spread on the road. There is something elegant to me about the simplicity of the building: it's a pointy dome because inside there is nothing but a pointy heap that it is keeping dry, and they look basically the same wherever you encounter them because the angle of the roof is set by the angle of repose for the heap within.