Social studies middle ages project ideas?

what precaution and preventions were made to water so those terrible things didn't happen again?

There are lots of topics to explore - feudalism, the vikings, Bubonic Plague, castle life, armor, guilds, women, heraldry, monastic life.

creating a shield using heraldric symbols

book report on historical fiction (wow, there's tons)

creating model of a castle or a viking ship

create a diary of a pilgrim visiting a shrine

report on Joan of Arc, Eleanor of Aquitaine, or Teresa of Avila