(1) Museo Nazionale Romano
This is a museum with four branches scattered around the central historical area, all devoted mostly to antiquities. Regular admission is 7 Euros for a cumulative ticket good for three days.
Taken together, their holdings are fully comparable to those of the Musei Capitolini (regular admission 11 Euros) and the Musei Vaticani (regular admission 15 Euros). But they're not nearly so well known - so you never have to wait in line, and, during the off-season, you're very likely to find yourself entirely alone, wandering among the most amazing treasures of Western Civilization, superbly presented, without even a guard in sight.
Kebab vendors are everywhere. Many prominently advertise their "halal" status. I guess maybe that should bother me, but, honestly, a cheap kebab only costs 3.50 Euros, which is about half what you'd pay for a cheap pizza. And, believe me, the average cheap kebab around here is better than the average cheap pizza.