** TTT - Minas Morgul

So they came slowly to the white bridge. Here the road, gleaming faintly, passed over the stream in the midst of the valley, and went on, winding deviously up toward the city's gate: a black mouth opening in the outer circle of the northward walls....Frodo felt his senses reeling and his mind darkening. Then suddenly, as if some force were at work other than his own will, he began to hurry, tottering forward, his groping hands held out, his head lolling from side to side. Both Sam and Gollum ran after him. Sam caught his mater in his arms, as he stumbled and almost fell, right on the threshold of the bridge.

--TTT, "The Stairs of Cirith Ungol"