Medieval altars and sculptures evoke the church’s 14th-century founding, but most of the Gothic exterior is a 1950s reconstruction. Germany’s premier organ manufacturer Arp Schnitger, who made instruments for Johan Sebastian Bach, crafted the massive organ with 4,000 pipes in 1693. To hear its sonorous sounds you may attend Sunday services or, better yet, stop in at noon on Thursdays to enjoy a free concert.