Things to do in Barcelona

Amusement park. But old. Very old. It's one of the three oldest amusement parks in Europe. The park and the tram that brings you up the hill to Tibidabo was opened and built in the beginning of the 20th century. The Avion, Carrousel, Ferris Wheel are more than 50 years old, at least. Back to the Classics.
The Ferris Wheel looks small, but remember, it's already more than 500ms up the hill. You can see the attractions of Barcelona: Sagrada Familia, Torre Agbar: only if you can open your eyes.