Second Age
In the Jackson "Hobbit" trilogy, Dol Guldur is depicted as a massive castle in ruins, heavily overgrown with brambles and thorny trees. According to Alan Lee and John Howe, the trilogy's conceptual designers, this aesthetic was used to give the impression that the fortress had been built by Númenóreans during the Second Age, only to fall into ruin when Númenór's power waned. Adrián Maldonado of AlmostArchaeology speculates that the derelict castle could also be interpreted by viewers as the ruins of Oropher's halls, erected during the Second Age when he ruled Greenwood the Great from Amon Lanc.