Zumthor's 2007 Cologne archdiocese museum — built directly over the WWII ruins of a Gothic church.
From Wikipedia
The Kolumba Museum is an art museum in Cologne, Germany, run by the Roman Catholic Archdiocese of Cologne. It is located at the historic site of the former St. Kolumba church, destroyed during World War II, and also includes the 1950 chapel "Madonna of the Ruins" by Gottfried Böhm.