Domschatzkammer Köln

Beneath Cologne Cathedral, the treasury lies in medieval vaults that reach down to the Roman city wall and a Roman sewer. Six rooms over three floors hold liturgical vessels, reliquaries and crosses, Christian art from the 4th to the 20th century. Some pieces are still used on particular feast days, such as the Baroque shrine of St Engelbert. The entrance is a dark bronze cube on the cathedral's north side.