Correct Ian, even down every innocuous looking alley or superficially grubby side street, turn the corner and you will find basilicas, amazing churches, temples etc.... and the museums are endless.
I was looking for the Pantheon, it wasn't signposted and it wasn't on my guide map. I was close to giving up on it.
So I asked the waiter of the bar I was sat outside and he pointed down the back alley of his bar.
I went down there, and the square just opened up before me, with the colossal structure of the Pantheon smack in the middle.
The size, scale and atmosphere of that 2000 year old building is something I'll never forget. But you have to go inside to appreciate it... outside it looks so dilapidated, as do many Roman buildings due to pollution and lack of funds to restore them. But inside.....!