Barcelona. Casa Batlló. Samantha Brown: While it looks like something out of a weird SciFi movie, the Casa Batlló shows Gaudí at his finest. I marvel at the detail in the skeleton windows and terraces and find the dragon legend to be pretty captivating. The roof is thought to illustrate the dragon’s back. This is one of only a few houses by Gaudí that can be toured in Barcelona. A morning visit will help you avoid the bigger crowds and they do sell tickets online if you want to save time.