At O'Brien's Tower, you find your next clue tucked beneath a stone. It reads: "The Roman Gold Mines are golden." You've heard of this most important mine in the Roman Empire, taking you where?

The Roman Empire fell before the Vikings made it into Roman territory, but if they had, they may have come across the historic gold mine of Las Médulas in Spain – the largest open-pit gold mine in the Empire. In fact, the Vikings did sail down along the Spanish coast, connecting with the Mediterranean and raiding coastal villages along the way.

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