And a warm welcome from Berlin. Designing the new Acropolis Museum in Athens was considered one of the greatest prizes in architecture when it was put up for tender. The man who won the competition was the architect Bernard Tschumi. He's had to take on the threat of earthquakes, hostile locals and the problem of building just a few hundred metres from the Parthenon itself. Finally this Saturday his geometrical marvel will open. We met up with Bernard Tschumi in Paris before he left for the Greek capital.