The Kahlenberg is a hill in the Vienna Woods, northern part of Vienna.
In 1628, Emperor Ferdinand II acquired the mountain from the Klosterneuburg monastery and allowed a hermitage for the Camaldolese Order to be built. Next, at the heart of the monastery, a new church of St. Josephs was built, together with a few houses around it. The village earned the name Josefsdorf.

Church of St. Josef is also called the Polish church on Kahlenberg; Jan III Sobieski, King of Poland launched his attack on the Turkish forces during the second siege of Vienna in 1683 from here.