As featured in The Da Vinci Code, this church was built by the Knights Templar in the late 12th century. The Red Knights held their secret initiation rites in the crypt here. Having started poor, holy, and dedicated to the protection of pilgrims, they grew rich from showers of royal gifts until, in the 14th century, they were stripped of their wealth, charged with blasphemy and sodomy, and thrown into the Tower. So it goes. Featuring a rare, circular nave, it's not quite as atmospheric as you'd expect—thanks largely to Victorian and postwar restorers. That said, it remains a fine Gothic-Romanesque church and occasionally holds concerts (check website for details).