I ran a search for the temple of Vesta to see if any recent pictures have been posted online, and I found the most beautiful reproduction I've ever seen.
There's nothing like trying to visualize something in your head and finally seeing it exactly the way you pictured it. (If they ever made a movie out of my book, just seeing the set would make me excited enough to wet myself.)
Although the picture is beautiful, it's not the most accurate. The roof is wrong; on ancient Roman coins, there is no second level. There's supposed to be a grate surrounding the outer wall (I have yet to figure out why). He also doesn't have enough steps. I don't know why an ancient historian took the time to specify that the temple of Vesta had nine steps, but whatever.
If you want to see the most accurate model of the temple of Vesta, click here.
Here's what the temple looks like today: