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I've always loved how Tolkien described the power of Barad-Dur as being reliant on Sauron. It was made with the power of the ring, which was a direct "vessel" (if you will) of his power. In a personal way... however the Dark Tower looks in our own minds is essentially how we as individuals view Sauron. Perhaps PJ saw Sauron as the tall lanky fellow who bullied him at high school... i see the Barad-Dur as being both wide and tall, denoting strength and immovability (stubborn and pig-headed if you will), the only weakness that lies in these two is the small and beautiful ring by which they both draw their power. A wonderfully poetic juxtaposition.