Since 2009, the GPIA Jerusalem has been exploring Jerusalem's Old City with Dieter Vieweger at the helm, in particular the Mount Zion area in the south of the city, inhabited from Iron Age II to the Middle Ages; the area beneath the Church of the Redeemer in the Christian Quarter, where the "Through the Ages" archaeological park has been established; and the northern part, in search of the legendary "second wall" from the time of Herod the Great.

Dieter Vieweger, German Protestant Institute of Archaeology in the Holy Land (GPIA), Jerusalem, Israel.