The Science museum on Exhibition Road in London sometimes has interesting things related to computers. I don't know if it's still on display, but there was a wo

The Science museum on Exhibition Road in London sometimes has interesting things related to computers. I don't know if it's still on display, but there was a working mechanical computer based on designs by Charles Babbage that wasn't built until relatively recently. It was made with modern machine tooling but with tolerances that would have been achievable during Babbage's time.