Castra Albana was a fortified encampment of the Legio II Parthica of Emperor Septimius Severus (2nd-3rd centuries CE). Its remains are located in the historic center of Albano Laziale and represent one of the largest urban archaeological sites in Lazio outside Rome. They include the so-called cisterns, evidence of the engineering mastery of the Romans. It is a large cistern divided into five aisles, which collected water from two aqueducts fed by the springs of Lake Albano. Built around 202 AD, it had a capacity of about 10,000 cubic meters. It is still functional and retains its original hydraulic mortar coating (
opus signimun
), which makes it waterproof. It can be visited and is located on Via Aurelio Saffi, in Albano Laziale.