Don't miss it, it is a gem. Beautiful architecture, painted ceilings, scultures, inumerable books,colour everywhere. These days there is an interesting and very rich exhibition about Kaiser Franz Josef with lots of photographic material of him and the royal family, historical analysis of his various roles and even personal letters to his mistress with translation. Don't forget, the entrance to the visiting part of the library is at the side part of Hofburg in Josef platz near the Albertina. Photos are allowed.