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Hut 8 at Bletchley Park - note the cycle rack out the front. Most people came to Bletchely Park by bike, so there are bike racks everywhere....
A core memory module - from the days before silicon chips. Each bobble in the square above is a tiny magnetic torus which is then threaded through with wire, by applying different voltages to the wires, you could chnage the magnet's state, and thus store data.