Over the Edge of the World, Magellans Circumnavigation Of The Globe by Laurence Bergreen.
Absolutely recommeneded ! Riveting read from start to finish, with lots of explanation on the larger world of life and politics in 1519.
If you're not familiar with the details, Ferdinand Magellan fled Portugal for Spain to lead an armada of wooden ships 60,000 miles around the world. He lost men, lost ships, quelled mutinies, suffered scurvy and starvation, and died in the surf of the Phillipine Islands by the spears and arrows of natives.
Five ships and 260 men sailed from Spain in 1519, one ragged ship with 18 sailors returned in 1522.
They were the first men in history to sail the entire circumference of the globe.
It was 60 years before anyone could accomplish the same feat again, despite repeated attempts with bigger and better supplied fleets.
If you enjoy adventure, history, or just a damn fascinating story, this is a good one.