I agree - would love to do a Six Nations tour of the stadiums. (kids and bank balance say no)
Shame Italy don't still play at the Flaminio. Being in the middle of town was ace. Mind you, the Olympic stadium saved my bacon once, being completely lost during a university tour in Rome with no wallet and no idea where we 'home' was, I had to retrace my steps back to where we were staying and the Stadio Olympico was one the landmark on my way back that let me work out where I was - arrived back just in time for breakfast and didn't get fined... (also thank god for Italian public transport not checking tickets!)
Been weird over the past couple of weekends with no games (Edit- that I can watch - can't get Pro14).