This is the trailer of the project „Back to future – Zwinger 3D” of the HTW Dresden, finished in 2012. It shows the historical development of the Dresdner Zwinger in 3D. For more than 300 years, this building has had an expansive history with 13 main building-phases. Some were build, others were only ideas of important people. This trailer is a short conclusion of an upcoming video about the architectural history of the Dresdner Zwinger.