Trinity's campus contains many notable buildings dating from the 18th and 19th centuries. These include the Chapel and Examination Hall and the Museum Building . Inside the walls, through which there are only a few entrances, the buildings face the quad. The total surface area is approximately 190,000m2 which is mainly contained within the walls with the exception of the Trinity College Enterprise centre and the Faculty of Health and Sciences to name a few. The Library is well worth visiting as it contains the beautiful Book of Kells, a masterwork of calligraphy and decorative design of the New Testament. It is housed in the university library, which is the largest in . This library is entitled to a copy of every book that is printed in or accounting for its large collection.