The aim is to make an online public database of these ubiquitous but understudied prehistoric , the researchers say. The team is hoping to flesh out a picture of regional hillfort fashions and to get a better idea of how these structures were used.
Starting Monday (July 8), citizens can submit information about their local hillforts on the . The researchers are looking for details like the style and number of ramparts, ditches or entrances. And they aren't just interested in well-preserved Iron Age forts; the project leaders are also seeking data on sites where crop marks are the only traces left. 
Eventually, the database dubbed "An Atlas of Hillforts in Britain and Ireland" will be searchable by region and by characteristics. It will also be linked toso that each fort can be studied in the context of its landscape, the researchers say.
"There is huge variety in where the hillforts were sited and the materials used to construct them," Gary Lock, emeritus professor of archaeology at the University of Oxford and co-director of the project, said in a statement.
"Hillforts in the upland areas are often stone-built, while those in lowland areas are often made of timber and earth," Lock added. "Some were constructed in prominent positions on the very top of hills, while others were on slopes or not even on hills at all. We want to shed new light on why they were created and how they were used."
Another co-director, Ian Ralston, of the University of Edinburgh, said they hope the project will lead to discoveries of new archaeological sites and new information about ones that are already known.
"We expect the results of this project to change our vision of these iconic monuments," Ralston said in a statement.
For all their prominence, hillforts have not been the subject of much academic research, the project leaders say. Most were built after about 700 B.C. and used until the Romans arrived in the middle of the first century A.D. But others were constructed even earlier and enjoyed use afterin some parts of Britain and Ireland.
Researchers also believe that hillforts were not military strongholds, but rather settlements occupied for short periods or meeting places for religious activities and festivals, and market days. The forts vary widely in style and size. Some in Argyll and west Wales cover less than 2.5 acres (1 hectare), while others like Ham Hill in Somerset enclose areas as big as 200 acres (80 hectares).
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