The three places to go and see his work is the church of Sagrada Familia, Parc Güell, and Casa Batlló. Sagrada Familia is a basilica that is still under construction. The church is beautiful and worth the €10 to visit. Parc Güell is a large park in the north of town. It has some very unique design elements and the world’s longest bench. Casa Batlló is a house built, and completed, by Gaudi on the main shopping boulevard. It is an amazing architectural sight.