In this episode Alberto Angela invites you on a small but fascinating journey: the four kilometers of the Grand Canal to discover the many extraordinary buildings that overlook this waterway and make Venice a unique city in the world. Behind every door, under every dome, many stories are hidden. The journey begins from Piazza San Marco: on one side the Basilica, on the other the Doge's Palace, almost symbolizing the balance between religious and political power on which the greatness of the city was based. Another pillar is economic power: Venice has been at the center of maritime trade for centuries. This resulted in wealth, luxury but also the continuous risk of epidemics. By visiting some of the most illustrious palaces, we see how the patrician families lived, how they dressed, why they wore wigs, why they used fans and what meanings the moles that women and men glued to their faces had.