Working on a story involving the 7 New Wonders of the World and the art of landmarks/heritage sites deteriorating over time. Are there any cool facts about UNESCO conservation efforts of the 7 New wonders as a whole?

Title says it all. Bonus/side note, main 'villain' is this guy named Aesop (because we don't even really know if Aesop was real)... To the naked eye, he's invisible to most and is blamed for the accelerated cause of erosion in the 7 wonders. If you have facts about Aesop, erosion, or things lost to time, that'd also be really cool and awesome!!