A Civilization 5 mod to highlight Antiquity Sites, in answer to my own question on Arqade:

http://gaming.stackexchange.com/questions/127047/how-can-i-keep-track-of-discovered-antiquity-sites

This is my first Civ mod, it's a quick and dirty hack currently but is functional.

Install the mod from here:http://steamcommunity.com/sharedfiles/filedetails/?id=169154575