Reales Atarazanas, Seville

Reales Atarazanas is a medieval shipyard, and these long brick vaults once served the Castilian crown as a naval base. The surviving complex belongs to a much larger scheme: “seventeen naves” were built beside the Guadalquivir, linked to the river by a sandy open area. The broad arches running between the naves explain the building’s purpose: they allowed large galleys and their equipment to occupy the covered space.

Construction continued under Alfonso X after Ferdinand III conquered Seville in 1248, with the work taking shape outside the city walls near the river. In 1253, “ten galleys” had already been completed. At its busiest, the yard could accommodate “at least 30 galleys and, on special occasions, up to 34.”

Hundreds of people were brought together for each major fleet: “between 400 and 500 artisans” worked on building and arming the vessels. These ships served campaigns around the Strait of Gibraltar and against England during the Hundred Years’ War. When those military demands faded, the yard changed character.

Its spaces became useful for markets, customs, and storage, including stores of oil, wool, and mercury. The shipyard operated from “the 13th to the 15th century,” leaving you with a remarkable piece of medieval industrial architecture shaped for warships rather than palaces.