Gaudi - Park Guell ............. Two pavilions at the main entrance complete the wall surrounding the park. Intended as a porter's lodge and administrative building, these pavilions are of stone with roofs of Catalan vaults of flat-laid brick finished with pieces of broken ceramic called trencadís. The ceramic trencadís follows the sinuous geometric surfaces, a device which gives all of the park's ornamentation a unique beauty. Each of the roofs is crowned by a small dome and above all stands a tall, spiral-shaped tower adorned with colorful tile and topped with Gaudí's characteristic four-branched cross.