Directly opposite, high on the cliff face, are three magnificent, crumbling Royal Tombs, similar in size and style to the Treasury.
The Royal Tombs are crumbling because they are so ancient.
mnli hypothesis: The Royal Tombs are crumbling because they are so ancient. premise: Directly opposite, high on the cliff face, are three magnificent, crumbling Royal Tombs, similar in size and style to the Treasury.