Megalithic monuments are the oldest buildings of Central and Northern Europe directly tangible to a broader audience. Archaeological investigations began very early but until the present day we lack a systematic database that covers all known sites. While there are such databases for the Scandinavian countries, for other countries, e. g. Germany, there are only printed collections that are very good, but in most cases have been written multiple decades ago. Besides that there are many private websites, that are mostly just photo collections of existing and easily accessible sites. Wikipedia could be an ideal place to connect scientific accuracy and private enthusiasm. In late 2009 we began to compile lists for all megalithic sites in Germany and later for the neighbouring countries. Our goal is to collect all megalithic sites in Northern europe, to describe them, to provide all relevant bibliographical references and to take photos of all the sites. The first three points are almost completed for Germany. Thanks to financial support by Wikimedia Deutschland since 2013 excursions have taken place to systematically photograph these sites. An extension of our work to other countries is intended.
This is an updated version of my poster presentation at Wikimania 2018