On the roof of the grotto cave, you find your next clue: "A meteoric sacred place holds the truth." You know this means you're headed to this Grecian monastery.

Having long traded with the Greeks, the Vikings actually became members of the Byzantine emperor's secret service, so to speak. Known as the Varangians, they were the imperial bodyguard. Perhaps that's how a clue wound up at Meteora, the 14th century Eastern Orthodox monastery, built on rock columns near the Pindos Mountains. Prior to the monastery's construction, monks had occupied Meteora's caverns since the 11th century.

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