Based on eighteen case studies the chapter discusses social values of urban wasteland areas. Therefore, it presents contemporary, post-human theories of vernacular models of democracy. Based on non-participatory observation, inventory of territorial markers and free-form interviews, processes, functions, users and possible development of urban wastelands are shown. The role of these places is perceived in two aspects, either as a substitute for the deficit of green areas or as their necessary functional complementation. Consequently, the main functions of these areas are informal activities, community gardening, extreme sports, and a place to live for homeless people, etc. Concluding, the authors state that in a development of urban wastelands, a new and open design approach is required. Future development of these spaces should preserve their values, such as: inclusiveness, freedom of creation, creative attitudes and social participation processes.