The Clock Museum has one of the most important collections of timepieces in Europe, with seven hundred clocks measuring time from around the world from all time zones. The exhibition presents scientific progress and technological precision, as well as social changes and design trends in the production of clocks. There are, among others astronomical clocks, luxury jewelry or ingenious Biedermeier and Belle Époque watches.
One of the most interesting exhibits in the museum is the so-called "Cajetano clock", an extended astronomical clock designed in the 18th century by the monk, David and Sancto Cajetano. It has 150 gears and shows not only the time of day in different places, but also the movement of planets, and even eclipses of the Sun and Moon.
The beginning of the collection dates back to 1917. It mainly comes from two private collectors. One was Rudolf Kaftan, a high school teacher and the first director of the museum. The second collection, in this case expensive pocket watches, was collected by writer Marie von Ebner-Eschenbach.