One of the last cards i've got from Belgium was also from Leuven and showing this church.
Standing in the middle of the Grote Markt Sint-Pieterskerk is a prime example of Brabant Gothic. Begun in the 15th C. by van Vorst, continued by Keldermans and de Layens, it was more or less completed by Joost Massys. Original plans envisaged three towers on the west side and a main tower of 165m/541ft. This work was abandoned as the foundations were on sand and previous buildings had collapsed. - in: http://www.planetware.com/leuven/st-peters-church-b-br-piet.htm
During the 19th and 20th centuries different renovation campaigns were undertaken. The church suffered considerable damage during the bombing raids of the Second World War in 1944. Between 1945 and 1963 the Saint Peter's church was partially rebuilt. In 1992 the restoration of the Western facade was completed. Bij 1998 the restoration of the choir was finished. - in: http://www.trabel.com/leuven/leuven-stpeterschurch.htm