The original church-abbey was founded in 966 but later completely covered by the multiple expansions of the abbey and was then forgotten for many centuries. These parts of the abbey were rediscovered near the end of the 19th and beginning of the 20th century. It has since been restored and offers a beautiful example of pre-roman architecture.
The other church-abbey buildings were erected to the East of the original church, on top of the rock and above the church itself.