In the morning, we took the metro to the closest stop near the famous Park Güell that was designed by Antoni Gaudí. From the metro station, it's a long walk up a big hill to the park entrance. Entry used to be free but now a ticket is now required to get in to the interesting parts of the park such as the front steps and the upper deck with the best view of Barcelona.
After Park Güell we went hopped on a bus and got off in the Eixample neighborhood which is north of the Gothic Quarter and is the modern part of Barcelona. Several buildings designed by Gaudí are in this area such as Casa Batlló reconstructed in 1904 and Casa Milà - La Pedrera. Casa Milà is currently being renovated and the exterior is completely covered up with scaffolding.