Passport in Time (PIT) is a volunteer archaeology and historic preservation program of the USDA Forest Service (FS). PIT volunteers work with professional FS archaeologists and historians on national forests throughout the U.S. on such diverse activities as archaeological survey and excavation, rock art restoration, survey, archival research, historic structure restoration, oral history gathering, and analysis and curation of artifacts. FS professional staff of archaeologists and historians serve as hosts, guides, and co-workers.