Minas Morgul (eng. Tower of the Dark Sorcery) is a great fortress founded by Isildur in the second age. Originally called Minas Ithil (Tower of the Moon), it was built as a shield against Mordor. By the time Sauron rose again, the Nazgûl conquered Minas Ithil, turning it into Minas Morgul.
Minas Ithil was once a beautiful silver city where Isildur planted a sapling of the White Tree. In TA 2002, when the city finaly fell into the hands of Sauron, an ill green glow started to shine from its walls, and it became known as a place of horror and madness. The Palantír of Minas Ithil, the Ithil-stone that was placed in the tower was stolen and possibly taken to Barad-dûr for Sauron.
The city was built east of the Anduin just at the base of the Mountains of Shadow in Imlad Morgul, it controls path through the mountains into Mordor and tower of Cirith Ungol. In later years it became a home for the Nine and their captain, the Witch-king, from where he commands the forces of Mordor. In the War of the Ring, he sent great armies from there up to Osgiliath and then on to Minas Tirith.
Minas Morgul is not yet accessible in game but we are very near it, with the Morgul Gate being the closest possible location to the city.