Vienna
Vienna, formerly the seat of the powerful Habsburg Empire, retains a sense of grandeur and elegance. Today, many of its parks and palaces are available to the public, and the chandeliered ballrooms and frescoed halls host a staggering array of museums. Although it may not appear to be an obvious family destination, there are several museums, parks, and gardens that are especially suitable for families with small children.
Many people come to Vienna to see the Natural History Museum. It's a veritable encyclopedia of natural wonders housed in one of two twin palaces. The Venus of Willendorf (the world's oldest sculpture) is the highlight for historians, but youngsters will flock to the dinosaur exhibits, which feature countless full fossils as well as moving, roaring, life-size artificial copies.
The House of Music blends grown-up exhibitions (portraits of great composers, artifacts from their life) with interactive exhibits that children enjoy, such as a musical stairway with each step a virtual piano note, allowing you to play your way up and down. There's also a wonderful virtual conductor installation in which Zubin Mehta, conductor of the Vienna Philharmonic, interacts with you and assists you in leading his orchestra - and if you're too choppy with your directing, the players will give up on you and grumpily cease playing.
If your kids like horses, take them to see the famed Spanish Riding School exhibition or perhaps a practice session (which are open to the public and ticketed). See the Lipizzaner horses in action, dancing and jumping, but make a reservation in advance. These events are frequently sold out, and the lines to get tickets on the day can stretch several city blocks. A free glimpse is available by peeking through the glass atrium of the stables across the street from the performance area.
Location: Austria