Books like The Enchanted Castle

This is a novel I like a lot, which I've experienced in different ways at different points in my life. I first read it when I was six or seven, and thought it was a great story. There are these kids, and they find a castle, and a magic ring. At first they think it's an invisibility ring. Then, to their surprise, they find it can make inanimate objects come to life, or make you rich. After a while, they come to a truly startling conclusion: the ring can do anything at all! When its latest power wears off, the owner can just tell it what new power it is to acquire. They come up with some creative ideas, which are a lot of fun; one of the best ones is where they find that the statues in the castle's grounds come to life at night, and they can themselves become living statues. One of the statues is a life-size brontosaurus. Like many seven year olds, I loved dinosaurs. This ring was amazing! The rest of this review is available elsewhere (the location cannot be given for Goodreads policy reasons)