From the Porta Romana one may do many thingstake the tram, for example, for the Certosa of the Val d'Ema, which is only some twenty minutes distant, or make a longer journey to Impruneta, where the della Robbias are.

Nothing, for instance, taken by itself alone, can be more satisfactory than the façade of the Certosa at Pavia; but it is not, like the front of Chartres or Rheims or Amiens, a natural introduction to the inner sanctuary.