Durin's Bridgeĭurin's Bridge was a single fifty-foot arch of stone spanning the great abyss at the eastern end of the Second Hall of Khazad-dûm, built as a last defense against invaders from the east. Dunharrow was easily defended, since it was reached by a switchback path that went up a steep cliff each level was overlooked by the ones above. Dunharrow was used by Gondor and later by Rohan it was one of the chief refuges ot eh latter country. Dunharrowĭunharrow was a fortress and refuge above Harrowdale, built in the Accursed Years by an unknown race. After the fall of Sauron, Celeborn took Dol Guldu and Galadriel threw down its walls and cleansed its pits. During the War of the Ring, armies from Dol Guldur attacked Lórien and the Woodland Realm, but they were defeated. Sauron retreated to Mordor, but ten years later sent three of the Nazgûl to occupy Dol Guldur. Sauron continued to rule his many servants from Dol Guldur until 2941, when he was driven out by the White Council. The power returned with increased strength in 2460, but in 2850 Gandalf again entered the fortress and discovered that its master was Sauron. In 2063, Gandalf went to Dol Guldur to learn the identity of its master, but the evil power fled. For the next thousand years, the power grew stronger and corrupted the forest. It was probably built by Sauron about the Third Age 1050 it was first mentioned about 1100, when the Wise discovered that an unknown evil power had settled there. Dol Guldurĭol Guldur was a fortress in southern Mirkwood. It was called in Orkish Lugbúrz and in Westron the Dark Tower. The Barad-Dûr was located at the southern end of a great spur of the Ered Lithui, and was the greatest fortress in Middle-earth in the Second and Third Ages. Sauron began to rebuild the Barad-Dûr in the Third Age 2951, but it was destroyed in 3019 when the Ring was unmade. At the end of the Second Age it was besieged and captured (3434-3441), but its foundations could not be destroyed while the Ring survived. Barad-Dûrīarad-Dûr was the fortress of Sauron, built by him with the power of the One Ring between the Second Age 10. Bag End was a typical, if somewhat more luxurious than ordinary, hobbit-hole. After Frodo went over Sea, Sam Gamgee and his heirs lived there. From September 3018 until her imprisonment and his death, lobelia and Lotho Sackville-Baggins lived in Bag End, and Saruman made it his headquarters in the Shire. Bungo, Bilbo, and Frodo Baggins lived there. Bag Endīag End was a dwelling in Hobbiton, built about the Third Age 2880 by Bungo Baggins at the end of Bagshot Row. Angband was destroyed after the Battle of the Powers, but its pits were not bared, and Balrogs and other of Melkor's servants hid there during their master's captivity. Built by Melkor after he destroyed the Two Lamps, Angband was first held by Sauron and was intended to guard Utumno against assault by th Valar. Angband was the great underground fortress, prison, barracks, mines, and factory of Morgoth, located 150 leagues north of Menegroth behind the southwestern corner of the Ered Engrin.

Angband vs utumno