My father used to own a very early copy of Carta Marina (hey, Olaus Magnus was Swedish and plain old Olof Magnusson before he became a scholar). He gave it to grandpa who put it up in his study. I used to play in that study when I visited my grandma 'coz it had all of grandpa's cool old stuff in it. I remember looking at the map and making up stories.
Olaus Magnus' "History of the Northern Peoples" is a hoot, its like a later and more mild-mannnered down-to-earth John Mandeville - about the place where I live.
I'd love to read about the early zoology stuff from that time. I managed to read some of "Of monsters and Marvels" the other day, it's very charming how they used to include elephants and ostritch as "monsters".