Welcome to Keys to the Past. This site unlocks the archaeological secrets of County Durham and Northumberland by providing access to a selection of records of the archaeology and historic environment of these counties, from the smallest Roman coin to the largest medieval castle, from the oldest prehistoric flint to more recent World War II pillboxes. Professional Users are advised that use of Keys to the Past (K2P) does not constitute a full HER search. The HERs are continually updated and provide more detailed information from a variety of sources. If you're unsure if using K2P will be appropriate for your purposes, please contact the relevant HER (Northumberland or Durham) to clarify.