Be wary of gladiators outside the colosseum. They don't take photos for free and can be quite agressive about their payment. Also don't be fooled into taking an unlicensed guided tour of the Colosseum either....
I went on two tours alone...I made life-long friends along the way! That's the nature of Contiki.
efti
Article on Travelling alone
This is awesome - you have to do it - so much information about the city - it really has an amazing history.
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MJ