Pope Leo on June 9 arrived in Barcelona where he will celebrate mass in the Sagrada Familia Basilica and bless the new tower that has made it the world's tallest church. It was completed after 144 years spent under construction. The Pope's visit coincides with the 100th year of its architect's death, architect Antoni Gaudi. FRANCE 24's Eve Jackson went to Barcelona to learn more about one of the world's most famous architects.