This video gives a good overview of Magellan.
And this site has some wonderful questions, writing prompts, and even crafts to provide a cohesive lesson this week--including making porcelain (? that's what it says) and spiced tea, sea rations, and an hourglass out of two-liter bottles. There are three pages of it! So glad someone else comes up with stuff like that for us...
If you're working on the memory work, try it to the tune of "Did You Ever See a Lassie?" Like this:
a Portugese explorer
dis-COV-ered a ROUTE
to SAIL around the WOR-ld
to PROVE it was ROU-nd!
Magellan did these things!