The height of its nave of more than 136 ft (41 m) reinforces the legend that its architect, Pierre Perrat, could not have designed it without the help of the Devil. True or false, this assembly of stone and lights makes Saint Stephen Cathedral in Metz one of the most popular in France. Its vaults, the second-highest countrywide, and stained-glass windows installed over several centuries attract more than 650,000 visitors every year.