Open Plaques is a community-based project which catalogues, curates, and promotes commemorative plaques and historical markers (often blue and round) installed on buildings and landmarks throughout the world. The service brings the history that plaques encapsulate to life - and to a larger audience - by building the definitive and most comprehensive resource about these historical markers. Anyone who has found a plaque in real life or on the internet that is not already in the Open Plaques database can add it. Even if you don't have all the details tell us as much as you can and a plaque hunter should eventually track it down....and no, it doesn't have to be blue.