Pope Leo was set to visit Barcelona's Sagrada Familia on Wednesday to inaugurate the newest of its soaring geometric spires that makes the modernist marvel designed by Antoni Gaudi the world's tallest church. Leo, after celebrating Mass inside the vast church, will walk outside to bless the 172.5-metre Tower of Jesus Christ, crowned with a five-storey ceramic cross visible across the Catalan capital. FRANCE 24's Sarah Morris reports from Barcelona.