What was in a royal tomb?
The Valley of the Kings actually consists of two valleys that run northeast from the slopes of a prominent ridge along a high plateau into the Western Desert.
The reasons New Kingdom kings chose the East Valley of the Kings for their burials are unclear.
At the end of the New Kingdom, Egypt entered a period of political and economic decline.
Weeks, Kent R. Measurements of KV Royal Tomb Components. In: Richard H. Wilkinson and Kent R. Weeks (eds.). The Oxford Handbook of the Valley of the Kings. Oxford: Oxford University Press, 2016. Pp. 583-599.