Hereford Cathedral Library - Credit: Wikimedia Commons
Hereford Cathedral Library is a working theological lending and reference library located in Hereford Cathedral, Hereford, England; it also holds books and manuscripts of major importance to the history of the county of Herefordshire. Hereford Cathedral Library is also well known for its chained books as it is the only library of this type to survive with all of the chains, rods and locks still intact. "The Chained Library", Herefordcathedral.org, 2009 Read more on Wikipedia
Source: en.wikipedia.org