By this time, half the people in High Norland were gathered in Royal Square to stare at the castle. They all watched with disbelief as the castle rose slightly into the air and glided toward the road that led southward. It was hardly more than an alley, really. "It'll never fit!" people said. But the castle somehow squeezed itself narrow enough to drift away along it and out of sight. The citizens of High Norland gave it a cheer as it went.
Diana Wynne Jones