Also very interesting, which most people don't know:
The Z1 is today considered to be the first freely programmable computer of the world. It was completed in 1938 and financed completely from private funds. Konrad Zuse's first computer, built between 1936 and 1938, was destroyed in the bombardment of Berlin in WW II, together with all construction plans. In 1986, Konrad Zuse decided to reconstruct the Z1.
The Z1 contained all parts of a modern computer, e. g. control unit, memory, micro sequences, floating point logic.
Konrad Zuses Contributions to the Modern Computer