Volkmarskeller is the name of a cave that used to have a church next to it in the vicinity of Blankenburg (Harz) in the German state of Saxony-Anhalt.
According to the Annales Cistercienses, after several years of preparation that had begun in 1135, the cave and church was officially opened on 28 July 1146 as accommodation for Cistercian monks from Kamp Abbey under Abbot Roger.
In 1146, at the request of the Abbess of Quedlinburg, Beatrix II, Pope Innocent II approved the founding of the abbey and the allocation to the monastery of estates in Marsleben, Groß- and Klein-Ditfurt, Sülten and other places (today mostly abandoned villages near Quedlinburg).
In the period from 1151 to 1167, the monastery was moved to Evergodesrode at the lower end of the valley at the present site of Michaelstein Abbey.
It is located in the upper part of the monastery grounds, just above the trail that leads from Michaelstein Abbey to the hamlet of Eggeröder Brunnen.