In 2004, a fire broke out at the Duchess Anna Amalia Library. The library contains a 13,000-volume collection including Goethe's masterpiece "Faust", in addition to the duchess's music collection. An authentic Lutheran Bible from 1534 was saved from the fire. The library is one of the oldest in Europe, dating back to 1691, and is listed as a UNESCO world heritage site. Over one million volumes were housed in the library, of which forty to fifty thousand were damaged beyond repair. A number of books were shock-frozen in Leipzig to save them from rotting. The library was reopened in 2007.