In a jewelry box within the castle, you find your next clue: "Travel up the longest river in Europe." What river would that be?

The Volga River was a great thoroughfare for the Vikings. They navigated Russian rivers, trading in honey, skins, leather, and beeswax along the way. Being that the 2,294-mile Volga empties into the Caspian Sea, they were also able to utilize it to trade with territories around the Caspian, where they bartered for silver, copper, gold, and silk, bringing it back to Norse country.

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