Ground Penetrating Radar (GPR) allows researchers to see underground without disturbing the surface. In California, GPR has been used to uncover ancient settlements, map utility lines, detect infrastructure issues, study geological layers, and locate natural resources. It provides a non-invasive way to study archaeological sites and understand the state's history. GPR acts as a virtual time machine that reveals California's evolution from indigenous communities to modern infrastructure. It is a valuable tool that has led to many discoveries and helps ensure public safety.