(via USA Today)
I have to confess that I went to the similar Lord of the Rings: the Exhibition at the Science Museum in Boston...all I can say is, it was freaking awesome and I don't regret the rather large ticket price AT ALL ;)
Harry Potter: The Exhibition takes visitors from the Hogwarts Express train platform through the Gryffindor common room, classrooms, the Great Hall, the Forbidden Forest and Hagrid's hut. The tour is populated with creatures from the seven novels by J.K. Rowling and six Potter movies: life-sized centaurs, Buckbeak the hippogriff, dementors, thestrals and Dobby the house elf. Along the way are vignettes featuring dozens of elaborate costumes and icons of the Potter universe, including Harry's magic wand and round glasses.