Roman Catholic cathedral in Strasbourg, Alsace, France. Strasbourg Cathedral or the Cathedral of Our Lady of Strasbourg. It was the world's tallest building from 1647 to And construction took 4 centuries, it started from 1015 to 1439
Been there - loved it~ Milan, Italy - Duomo di Milano (Milan Cathedral) . "The cathedral church of Milan, Italy, this Gothic cathedral took nearly six centuries to complete. It is the fourth-largest cathedral in the world and the largest in Italy.