Arsenale in Venice is where the ships were built. The ships that made the Venetian empire so wealthy and influential. In times of crisis the ship builders (the arsenalotti) could build a ship in a week, and these skilled craftsmen were well rewarded, with a good salary and 500 litres of wine a year.
Ships moved the glass and silk that made Venice rich. Today, Arsenale is being redeveloped as a science and business hub: a group of engineers were testing underwater UAVs.
Lots of it is still undeveloped, and decaying.