Look inside the richest and oldest Library in the world

A woman visits the Abbey Library in north-eastern Switzerland's St. Gallen city, on April 20, 2018. The library is one of the richest and oldest in the world and contains 170,000 works and some 2,100 original medieval handwritten manuscripts, including the earliest-known architectural plan drawn on parchment. (Xinhua/Xu Jinquan)