VR-Annotate is a research tool of the project Archaeological Spaces run by the Cluster of Excellence at the Humboldt-University Berlin. It’s an innovative VR simulation environment where domain experts, such as archeologists, can dive into simulations of ancient locations while adding and sharing annotations with other experts. The simulated VR-environments are mapped with precision to real GPS locations and can thus be viewed and extended through upcoming AR projects, for example those with the Microsoft HoloLens. The annotations are stored as JSON-Schema format and can thus beembedded into other research projects. VR-Annotate was built in Unity, and it s source code and extensive documentation has been shared as open source on github.