Mapping the Chinese and Islamic Worlds: Cross-Cultural Exchange in Pre-Modern Asia | 
pickRead this for work & thought I would mention it for two reasons. First, if you are interested in geography, mapmaking, the process of discovery, this offers a fascinating, albeit it scholarly, look at the subject (fair warning, it is definitely aimed at students/academics). More importantly, every time I read something like this, I marvel at people venturing out into the world without GPS, without knowing much about what is beyond the horizon.
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