- At the very entrance to the Fortress is the highest central tower, Tower I or the Keep. The commander of the Fortress once lived in this tower
- It had three floors and two platforms at the top, while all other towers had a ground floor, two floors, and a platform. What sets this tower apart from the others, besides its size, is that it is the only one with a toilet on the second floor, which the commander of the Fortress used
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