Here are some of the places that can be visited in Vienna with children:

The House of the Sea (www.haus-des-meeres.at),
Zoo (www.zoovienna .at),
Prater (www.prater.at),
Aquapark (www.thermewien.at),
Natural History Museum (www.nhm-wien.ac.at),
Museum military history (www.hgm.or.at),
Technical Museum (www.technischesmuseum.at),
Music House (www.hausdermusik.at),
Butterfly House (www.schmetterlinghaus.at) ,
Underground Lake in the Vienna Woods (www.seegrotte.at),
Thermal Baths in Baden (Vienna Forest) (www.roemertherme.at)