There is so much to see: from the Gothic cathedral of St. Stephan´s over the imperial palace right to the Jugendstil grandeur of the Secession; from the magnificent Baroque palace of Schönbrunn through to the Kunsthistorisches Museum and right to the architecture of the modern day in the Museums Quater. A record-breaker: In Vienna there are over 27 castles and more than 150 palaces.

You can find all of the sights of the city here:

http://www.wien.info/de/sightseeing