Montjuïc is one of the 2 hills beside Barcelona. On top you can find a botanic garden, an old castle and a wonderful sight on the harbor, the see and the city. Your ticket for the public transportation allows for the funicular and the ropeway to come to the top easily. You can also walk uphill or take one of the busses. We had to take the funicular first and then the bus, because the ropeway was closed for service. What a pity.
Later we walked downhill. Every now and than you can get another interesting view of the city.