Constructed around the same time as the abbey cathedral, the library building houses the oldest literature collection in Switzerland, and one of the oldest and richest in the world.
It all dates from the 8th-century Carolingian monastery and includes thousands of manuscripts, incunables and early prints.
There are 160,000 volumes in all, many hugely significant.
Take for instance, a version of the Rule of St Benedict, which set out the rules for medieval monks, or Manuscript B of the epic poem, the Nibelungenlied.
