Barcelona aquarium has got to be the worlds most important mediterranean themed aquarium and a must to visit whilst you are in this fabulous city the spectacular oceanarium is the only one of its kind in europe is the largest tank and the one with the largest number of species in the aquarium with a diameter of 36 metres and 5 metres in depth it contains 4 500 square metres of water and contains many diverse species why not combine your visit to barcelona aquariumwith other famousattra