Over a period of two years (2019-2022), June Fàbregas and me investigated one of the largest inner-city construction sites in Europe: Stuttgart21 in an artistic-experimental way. For the project we interpreted the construction as an archaeological site and took on the role of excavators by photographically documenting the construction site, collecting left over materials, 3D scanning them, archiving them, and examining them for their aesthetic and functional characteristics. The collection of 3D scanned find scan be explored through a digital archive www.city-mine.online. The digital archive serves as a platform to receive further information on the found materials to evoke their value and making it more accessible to reuse the material. At the same time, it serves as a documentation for the future when the process of construction of Stuttgart 21 is completely displaced and no longer perceptible. The individual contributions of the project were presented during an exhibition at the project space Kunst[]Klima in Stuttgart. For the exhibition we designed an Earth room, that was created using various excavated soils from the construction site. Visitors were invited to "go underground" through the earth room and explore the different contents of the project and create reference between layering, reinterpretation and superimposition.