As part of the project “Hanging Gardens – A City Crown for Halle by Walter Gropius in Virtual Reality”, a central building project of Classical Modernism can be experienced and walked through for the first time, which – had it actually been built – would have made the city of Halle known worldwide as a centre of Bauhaus architecture. The article provides insights into the development, design and implementation of the interactive VR installations. The basis is formed by 15 preserved original drawings and years of research work. Over several steps, the topography of the area was built up, the 92-year-old drawings interpreted and digitally recreated, and 3D models developed and visualised.