"The earth... is divided into three parts, one of which is called Asia, the second Europe, the third Africa... Apart from these three parts of the world there exists a fourth part, beyond the ocean, which is unknown to us."
---Isidore of Seville, Etymologies (circa A.D. 600)
I actually bought this book. I offer that observation as a form of high praise, because I read lot of books and long ago decided it was impractical to buy them; our family are therefore ardent advocates of our local public library system (and enthusiastic supporters in various ways).
I checked this one out from the library based on a review in Harper's or The Atlantic or somewhere, and before I was a quarter of the way through I was ordering the book ($30 new, ~$9 from Amazon). The focus of the book is on the Waldseemüller map - the 1507 map that was the first to include the term "America" in identifying the recently-discovered western lands [note the word was placed on what is currently South America]. A thousand copies were printed - only one survived, and it is now owned by the Library of Congress.
The story of the map itself is most interesting, but the book ranges far beyond that story to encompass the whole history of cartography from antiquity through the 16th century. It's not a quick read - 400+ pages, lots of details, fortunately lots of illustrations, lots of worldviews and concepts of the cosmos - but all of it quite lucidly expressed, and to my view at least, endlessly interesting.