Los yacimientos olvidados: registro y musealizacion de campos de batalla is a project that aims to encompass all aspects of battlefield archaeology, in order to be a reference work in this study area. Therefore, a detailed historiographical study about this branch of archaeology has been made, from early origins until the present day, allowing us to gain a deeper understanding of the evolution of battlefield archaeology. Two methodologies, archaeological and museographical, are proposed for the treatment of this particular type of archaeological site. In order to prove the viability of both methodologies, a theoretical application has been carried out in two research examples from different periods, demonstrating both the project's methodological validity and reinforcing our theories. Two registers were made regarding battlefields - one historical and another archaeological. The purpose of this was to catalogue all possible existing sites in the interior of the Iberian Peninsula from Roman times through to the Spanish Civil War, which will hopefully serve as a point of reference for future researchers. Through this book, people will be able to understand the great potential of Spanish battlefields and their heritage. Furthermore, Spain could be regarded as a very important country regarding battlefield archaeology.