I'm tending to agree with just letting them be... Could I at least have them read a guide book & see if there's anything they'd like to see??
Are the "Roman Guards" by the Palantine or the main entrance? Maybe go in thru the Palantine & out to find the guards for photos. since the 'Girls Next Door' did that, I'm sure they'll want to... Gives you an idea of the cultural sohpistication of my 16 year old