During the two last decades, numerous inventories of geosites have been carried out at various scales. They aim at documenting the state of the geological heritage, which is the basis for management strategies. In very humanized regions, where the original geomorphology has been highly modified by human infrastructures, agriculture, urban sprawling, and various modifications of landforms, it is important to inventory not only the landforms visible today but also former landforms destroyed or hidden by human activities. To address the issue of inventorying invisible geomorphosites, two approaches weretested in the Rhone River valley (Switzerland). The first was an inventory of geomorphosites of the study area. Not only the visible landforms but also the landforms that had completely disappeared were evaluated with the assessment method of theUniversity of Lausanne. A total of 28 geomorphosites were assessed including five missing sites (two sand dunes areas, a braided sector of the Rhone River and two former marshes). These invisible geomorphosites were assessed and their management was discussed. The second study was a multi-method analysis of former landscapes of the 19th century. Several data including historical maps, written archives, digital terrain model and iconographic sources were combined and allowed the reconstruction of palaeolandscapes and landforms. Both materials allowed proposing a strategy for geotourism development