The purpose of the research is to understand the potential of polarimetric and SAR response of different archaeological structures on the surface and subsurface over different landscapes and to define and propose a methodology for the integration of information extracted from polarimetric radar as a new, additional tool for archaeological applications. Test sites selected for this work are Vulci, Arpi (Italy), Gebel Barkal (Sudan) and Calakmul (Mexico). Interesting preliminary results of relevance for this humanistic science are shown, based on the joint use of polarimetric SAR and optical data.