Landauf, LandApp BW is an interactive Citizen Science project that invites local communities to contribute their knowledge about landmarks and historical buildings in Baden-Württemberg, Germany. Developed by LEO BW and the National Archive of Baden-Württemberg, this App provides a platform for citizens to document and share their insights about the region's cultural and historical heritage. Users of the Landauf, LandApp BW App, developed by the SPOTTERON Citizen Science Platform, can upload photos of landmarks, such as famous castles, historical sites, and hidden gems like wayside crosses and boundary stones. The App allows them to categorize, describe, and geolocate their contributions on an interactive map. In addition, users can engage with each other by liking, commenting and discussing posts, making it a dynamic platform for sharing local history and fostering community interaction.