HER Land Map Archaeological Sites. Tees Archaeology maintains a record (the Historic Environment Record, or HER) of all the known archaeological sites and historic buildings in Hartlepool and Stockton-on-Tees. The HER is a digital record based on a database and a Geographical Information System (GIS), and includes many different types of site, from occasional finds of coins and pottery to World War II pillboxes and medieval villages. The digital HER is supported by a large archive of sources, including books, reports, maps, historic photographs, aerial photographs and our archaeological archive.