Apollo 16

What John Young told Nixon when he came back, rocked the old bastard to the bones. Apparently they were not the first to visit the moon! Signs of Viking shipyard and buildings shocked the astronauts! They have found abandoned settlements, plus brewery, an obvious set up for drink 'n' feast on the way to Valhalla. But the most amazing find was untouched by erosion runed stone in a middle of a worship crater, stating: RAKWUN URZUZ THURZIS, or in general translation - Death to False Metal!