Zutphen is a small, but very modern city. The old centre with brick houses from the 16th-17th centuries survived the war almost entirely. The main sight is the Grote Kerk, or St Walburgis, which dates from the 12th century and contains monuments of the former counts of Zutphen and a fine modern monument to the Van Heeckeren family. A unique attraction of the city is Librije, a beautifully preserved 16th century library of manuscripts on chain, built-on the the Walburg Church. Another eye-catching defense is the Berkel Ruin.