ORF initiates this cultural event every autumn. Austrian museums and private art galleries open their doors to welcome visitors from 6 p.m to 1 a.m. Apart from regular exhibitions, there are many special events in Vienna and other cities.
With a single admission ticket, you can try to visit as many museums as you can in one evening.
By the way, public transportation services in Vienna, as well as some guided tours, are also free during that night.
The Long Night of the Museums covers not only Vienna but the whole Austria so don't miss out!