It was constructed with a reinforced frame, designed to hold the weight of a dragon sitting atop it without collapsing, to withstand cannon blasts and hurricanes. It was the most overconstructed edifice in the entirety of Canterlot Castle, purchased out of Celestia's own pocket over the course of a century. Nopony could hear what happened within it, for the walls bore no sound to trespass beyond them. Nopony could see within, for the tower held no windows through which eyes may peer.