It is sort-of the other way round. There is an immense number of dilapidated castles, keeps, strongholds or oppida all over Europe, with most of those barely v

It is sort-of the other way round. There is an immense number of dilapidated castles, keeps, strongholds or oppida all over Europe, with most of those barely visible to an untrained eye, and they have been catalogized for decades.