We started the day, knowing little about Antonio Gaudi and ended feeling a bit like an expert, Sandra was flexible in expanding the tour from just the Sagrada Familia to include a cab ride to Park Guell and then another cab to Casa Mila to really immerse us in the man's genius (or madness). We met early, to avoid the worst of the crowds at Sagrada Familia. We are each 70, so she tailored the tour to challenge us, but not cause a heart attack!! She was very gracious, and knowledgeable and customized the tour to our interests and many questions. While everyone talks about the Sagrada, Casa Mila and the snake-skeleton display in The Laundry attic really drove home the point of nature in architecture. Gaudi was a genius, and Sandra helped us see his brilliance, but also his pain.