This is the site really deserving of inscription. Historical significance of this place justifies its presence on WHS list. Beautiful Svetitskhoveli Cathedral and Jvari are highlights of this site, but it's worth to go for a stroll and see old streets of Mtskheta. The best way to get to this ancient town from Tbilisi is marshrutka: cheap and quite comfortable. I recommend to take a taxi from Mtskheta to see Jvari Monastery.