This is a remarkable series, repeated by the BBC in 2021, and just as good as when first broadcast. Dan Cruickshank is one of the great documentary makers/presenters, every one of his series and one off programmes has been outstanding, his knowledge is second to none among architectural historians and he is excellent at communicating it. I can't understand all the hate directed towards him in other reviews. Presenters should be themselves, Dan happens to be upper class, his enthusiasm is infectious, and he only makes programmes about subjects he has great knowledge and interest. This series is remarkable as it was filmed as one nearly six month trip, a huge investment by the BBC and personal challenge for those making the series. Many of the treasures are the obvious usual suspects but I also saw many places I'd never seen before on TV and that helped to make the series special.