This discussion seems to be going a bit off-topic...
Anyway, I always imagined Dol Guldur being both on the surface and underground - a sort of basic fortress structure on the top, and then a much bigger and more complex set of prisons and other foul places beneath the surface. It would sort of get more evil the further down you went.
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'Dangerous!' cried Gandalf. 'And so am I, very dangerous: more dangerous than anything you will ever meet, unless you are brought alive before the seat of the Dark Lord.'
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