Most of Vienna’s museums open their doors daily. Some are closed once a week, often either on Monday or Tuesday. The daily opening times vary from museum to museum, but you can generally assume that a museum will be open between 10.00 am and 5.00 pm. Some of the large museums offer art lovers one late evening per week and stay open until 8.00 pm or 9.00 pm. On some special occaisions like national day (October 26) entry is free in the most museums.
Every year hundreds of museums from Eisenstadt to Liechtenstein are open during the night and you only have to buy one ticket for ever museums. If you are quick, you may manage to see at least three or four museums of your choice. The atmosphere is very special in the so-called Long night of museums.