Using Wiligut's prophecies as his guide, Himmler selected Wewelsburg castle in Westphalia to serve as a base for many SS operations. The architect Hermann Bartels was employed to oversee renovations to the castle to make it fit for the SS's use. As part of these alterations, one of the rooms in the building became known as "the Grail Room" with a rock crystal representing the Holy Grail being placed in a central position. Himmler also established a private museum at the castle, employing the young archaeologist Wilhelm Jordan to manage it.