This is interesting, it’s a video looking inside what is thought to be the world’s most expensive book. The book is John James Audubon's Birds of America. Apparently it caused something of a sensation when it was published in the 19th Century. It has been valued at between £4m and £6m and is being sold as part of the collection from the estate of the 2nd Baron Hesketh. Whilst quite impressive what is interesting is that the illustrations would have been completed by people who had never actually seen a live example of the birds in question, hence why they lack background detail and in some case they were dismissed an inaccurate.