You do find gold in the Roman gold mines: your next clue. It reads: "Travel to the bluest of grottoes." You know of one blue grotto in Capri. Where's that?

You can imagine the Vikings kicking back after a hard day of raiding in the mesmerizing Blue Grotto of Capri in Italy. The sea cave on the island coast invites just enough sunlight in to illuminate the grotto, creating a magical and almost spiritual atmosphere.

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