The watch towers in Malta: a patrimony to preserve for the future

In this contribution we will focus on some results achieved within the international bilateral project "Non-invasive investigations to enhance the knowledge and the enjoyment of cultural heritage" (funded by the Italian National Research Council and by the University of Malta). In particular, we will focus on some GPR and geoelectrical investigations performed on the so called Red Tower and on the so called White Tower, both on the western side of the island of Malta.