The tower of Barad-dr has been the stronghold of Sauron in Mordor for centuries. During the Second Age it was besieged and destroyed by the Last Alliance. When Sauron began to make war on the Free Peoples again, the tower was rebuilt and now holds atop its peak a great fiery eye, lidless and all-seeing. It is one of the Two Towers, along with Orthanc, tower of Isengard.