This miniature (shown is a greenhouse in Hogwarts) is by the same lady who made the miniature of the Burrow that is circulating. You have to go visit this page, there are so many amazing pictures and more sets, along with an interview of her about her miniatures and her process of making them. It's amazing!
My only Harry Potter World advice, is to get early admission and take a dueling photo in the middle of Diagon Alley, if you wait any longer, the place fills up with people trying to take pictures of the fire breathing dragon which is also very cool! Enjoy mine and my sisters witch dueling photo. Disclaimer...I added the magic edit coming from our wands, our Dad took the photo, there isn't any secret thing that takes this photo but get creative =] have fun