I find it curious that Galdalf was able to enter Dol Guldur when Sauron was present.
How did he manage this? If Dol Guldur was a stronghold you imagine it being foritfied with stone walls and a big main gate, staffed with legions of evil men, orcs and wraiths. But would Galdalf be able to entre through the main gate with Sauron present? Surely not, even if he came in disguise. Perhaps he came into the underground catacombs through some back door he discovered. Or maybe Dol Guldur was more like a haunted village, much like the town of Minas Morgul.
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