What made it all the scarier was that the castle did not stay in the same place. Sometimes it was a tall black smudge on the moors to the northwest, sometimes it reared above the rocks to the east, and sometimes it came right downhill to sit in the heather only just beyond the last farm to the north. You could see it actually moving sometimes, with smoke pouring out from the turrets in dirty gray gusts.
Howl’s Moving Castle by Diana Wynne Jones
Middle Grade Carousel 