These are 23 dungeons, built between 1792 and 1796, hidden within the 15m-thick city walls. These dungeons were the last major construction carried out in colonial times and were destined for military purposes. The vaults were used by the Spaniards as storerooms for munitions and provisions. Later, during the republican era, they were turned into a jail. Today they house rather touristy craft and souvenir shops.
