It was the palace that gave the illusion that the city was actually suspended in the air, Erin noticed as the train got closer. Most of Canterlot was actually built on level ground, but it was the palace with its tall towers that hung over open space. She stared at it every time it came into view. Something like that shouldn't exist. That much weight... how did it stay up? She was no engineer, but it looked to her like at least part of the palace should have snapped off and tumbled into the valley below by now. And many of the towers looked far too delicate to support their own weight. 