The Passeig de Picasso side of Parc de la Ciutadella is lined by several buildings constructed for, or just before, the Universal Exhibition of 1888. The medieval-looking caprice at the top end is the most engaging. Known as the Castell dels Tres Dragons (Castle of the Three Dragons), it long housed the Museu de Zoologia, which is now closed. Montaner put the 'castle’s' trimmings on a pioneering steel frame. The coats of arms are all invented and the whole building exudes a teasing, playful air. It was used as a cafe-restaurant during the Universal Exhibition.
