About the artifacts:
-You can't just search for them. They are at randome locations - so just go as many ports as possible - you're bound to find something along the North African coast.
-About the shovel - you build roads with it. There are some cites that have no sea acces - to trade with these cities you need a caravan (just buy some donkeys) and travel on the land. To speed up these travels - build roads (using the shovel).
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