The "Chapel of the Holy Cross" was the place, where the valuable "True Cross" relic was shown. Only about 300m east of the Abbey, the chapel was as well a center of a graveyard. Still today many carved graves are to be seen. It is built on the layout of a cross with four apses and a narthex. A pretty complex and unusual design - and still the chapel seems very much intact.
Unfortunately the gate at the entrance to the ground was locked. So that I could not even could come near to the chapel, not talking about having a look inside the building..