Even though the weather was not so great when I was visiting Barcelona, on one day I anyway decided to go to Parc Guell. It is yet another of Gaudi's creations and he even lived there with his family for a few years. I can imagine that on a sunny day the park is a great picnic or romantic getaway spot. However, on a gray day there is not much to do there.
The main entrance to the park:
Park's famous lizard:
Detail of the ceiling:
The roadway viaduct:
Views from the park to the city: