by Gerardus Mercator
The atlas, as well as being a remarkable survivor and a snapshot of a vanished world, is a volume of great beauty. Maps of Europe by both Mercator and Abraham Ortelius sit alongside exquisitely detailed city plans like that of Ancona. The iBookTreasures version allows you to magnify the tiniest details and fully appreciate why Gerardus Mercator was the greatest map-maker of his, or any other age.
This iBook contains the complete manuscript along with transcriptions and audio commentary.