Starting from key dates in German history, the museum presents a look back(wards) at decisive historical events of the 19th and 20th centuries. It brings actual turning points face to face with what might have happened if it were not for various factors. Along 14 distinctive caesurae in the German history the probabilities of unrealised history – prevented by accidents, averted by misfires or other kinds of shortcomings – are explored: it is that which is known in the philosophy of history as contingency.