Being serious now, I would also say the Nou Camp, its just immense. I would love to visit there, unforunatly Rangers and Barcelona never get drawn together in the Champions League.
Also I think that in the UK the best club stadiums are Ibrox, Celtic Park, Old Trafford and Anfield. They are the only world class club stadiums in the UK.
Again I think the Stade Delle Alpi is impressive-i jusyt think it looks smart.