- Barad-dûr was originally built during the Second Age, and leveled after Sauron's defeat in The War of The Last Alliance of Elves and Men.
- Barad-dûr fell under siege for seven years by the Last Alliance of Elves and Men during the Second Age, and was leveled after Sauron's defeat at the hands of Isildur, but because it was created using the power of the One Ring, its foundations could not be destroyed completely while the Ring itself still existed. As Isildur failed to destroy the Ring, the tower was eventually re-built when Sauron returned to Mordor thousands of years later. During the Third Age as he regained his power, Sauron had Barad-dûr rebuilt.
- Only when Frodo Baggins (with the unwitting aid of Gollum) destroyed the One Ring, the Tower was finally brought down. Without Sauron's power from the Ring to sustain it, it could not stand. The moment the One Ring was cast into the fires of Mount Doom and was unmade, Barad-dûr collapsed into ruin, never to be rebuilt.
- The Lord of the Rings, Appendix A: Annals of the Kings and Rulers, I: The Númenórean Kings, (iv): "Gondor and the Heirs of Anárion"
- The Lord of the Rings, The Return of the King, Book Six, Chapter III: "Mount Doom"
- It is called Lugbúrz in Black Speech, the language of Mordor.
|Regions of Mordor - not the expansion|
|March of the King • North Ithilien • The Wastes|
|Regions of Mordor - The Expansion|