The Valley of the Forgotten Kings
Sanctum was uninhabited when humanity first discovered and colonized it. Which makes the Valley of the Forgotten Kings that much more mysterious. A fertile river valley stretching some 15 kilometers. The river that meanders along it is lined with massive statues. Each of the statues stands 100 meters tall, and is of a human male, head bowed, and hands clasped before them. A pair of these statues faces each other all along the river.