The Lord of the Ringsis a story that's rich with details. This applies to J.R.R. Tolkien's original novels and Peter Jackson's subsequent movie adaptations. Those details help explain why Aragorn (Viggo Mortensen) can't use his newfound Army of the Dead to storm Mordor, or why Gimli (John Rhys-Davies) is seemingly the only Dwarf in Middle-earth. Surprisingly, one major detail has escaped some fans' notice, and it concerns the dark lord Sauron. Sauron is as close to pure evil as one can get, using his dark influence to forge the One Ring and bind the other Rings of Power to it. Even losing his physical body didn't stop his ascent to power. Part of that ascent lies in the construction of the fortress Dol Guldur, also known as the Hill of Sorcery, where Sauron retreated to spread his influence.