Visitors come to the magnificent Klosterneuburg Monastery outside Vienna—which recently celebrated its 900th anniversary—for many reasons: to celebrate the foundation of the Austrian state (which more or less began here), to pray in the imposing Baroque church, to tour the ornate imperial residence built around it as a kind of Escorial, to see the crown of the Archdukes of Austria, to venerate the relics of the monastery’s founder, St. Leopold of Babenberg, and to contemplate the world-famous masterpiece of medieval art housed here—the gold and enamel reredos made in 1181 by Nicholas of Verdun.