L. Frank Baum,
Twinkle and Chubbins: Their Astonishing Adventures in Nature-Fairyland
“ It overlooked the lovely city of palaces like a dark cloud on the edge of a blue sky, and the girl could not help giving a shudder as she saw it. All around the castle was a high fence of iron spikes."That fence is enchanted," said the turtle, as if he knew she was looking at it; "and no fairy can pass it, because the power to prevent it has been given to the giant. But a mortal has never been forbidden to pass the fence, for no one ever supposed that a mortal would come here or be able to see it. ”
