A database of archaeological objects found by members of the public in England and Wales. Hopefully the NonCommercial clause of the licence will be removed soon:...

Pleiades is a gazetteer for ancient world studies operated by NYU's Institute for the Study of the Ancient World and supported by the US National Endowment for the Humanities....

Open Plaques is an open source project (both code and data) has data on over three and a half thousand commemorative 'plaques' (often blue and round) that can be found across...