Parc de la Cuitadella
Another place recently visited in Barcelona was this park, which is right next to the Estación de Franca, where many trains from Vilanova terminate.
The park was created towards the end of the 18th century and was the guest place to be designed specifically as a park.
Within the grounds there are several century old trees, a wide biodiversity range of plants, and some interesting buildings, and a pond/lake where ducks swim.
More details can be found here...
And I thoroughly recommend a visit