I vaguely remember this steampunk movie I saw once when I was younger. I remember there was a tower or tall building on an island in it. There was also a foggy forest which contained a field with holes in it where tractor things would kill people. I think the movie was about this young boy and his friends, and I think I remember one of his friends got trapped in the field and the boy had to go save him.
PS: It was in English and in color, if that helps any. I remember looking modern and I saw it as a kid so I think it was from the 2000s.