Prompt 758 - Creative

[comicfan]

The new house next door always seems empty but an incredible garden seems to be growing in the backyard. One day your curiosity gets the better of you, you open the side gate, pass through the mushroom circle, and begin to follow some stepping stones that lead to a path. As you walk through the path you see rolling hills, castles, and even swear that a unicorn was standing at the edge of the forest. The problem is you live at the edge of the city and there are no hills, never mind there being castles anywhere close. What happened when you entered the garden?