The wrought-iron dragon gate of the Güell Pavilions on Avinguda de Pedralbes, built between 1884 and 1887 as the entrance lodges to Eusebi Güell's summer estate. The dragon is Ladon, guardian of the Garden of the Hesperides, taken from Jacint Verdaguer's epic poem L'Atlàntida. Look at its open jaws…