What is there to see in barcelona that not many people know?

Question

i would like to see something special, something hidden. a part of barcelona that it's not that known.

Answer 1

You can see the ruins of the Roman Empire, the ruins of the cartago imperium,  the Sagrada Familia.  the colon, you can  go for  the Theme park of  PORTAVENTURA PARK. you can go from the  pirineos  mountains.

etc

Answer 2

My recommendation is  to take the cremayera train up to the Tibidabo historical amusement park. The place is well know by the locals but not necessary to the common visitors who travel the city only  for a few days. The cremayera train is a "weird" ride up the mountain in an old tran full of graffiti but the best view of the city is waiting for you on the top. Check the train schedules because the train and the park works intermittent on winter. If you have kids they will love the place.