In this city, an 1888 “Universal Exposition” led to the creation of its Castle of the Three Dragons. This city’s Block of Discord (10[1])includes a building with a roof reminiscent of a dragon’s back nicknamed the House of Bones. In this city, 86 Doric columns support a Greek theater at the top of a staircase featuring an example of trencadis (“trung-kuh-DEES”), a multicolored mosaic salamander. (10[2]-5[1])That park (10[1])in this city, like pavilions (10[1])that featured a wrought-iron dragon gate, is named for Eusebi Güell (“oh-ZEH-bee GWAIL”). This (10[1])city hosts an unfinished structure intended to have (10[1])18 towers that was primarily designed by Antoni Gaudí (10[2])(“gow-DEE”). For 10 points, the Sagrada Família (10[1])basilica is located in what largest Catalonian (10[1])city? ■END■ (10[1])