(Side note: Breads, Baths, and Beyond would be a good title for anything about Rome. As flour was given out as a form of welfare, and the baths were free)
Bricks begin to date buildings (some bricks are stamped with dates).
Grids tell the story of design and construction (Despite Rome's shall we say, organic growth, roman founded cities were completely different, and well ordered and organized).
Slopes of ruins show changes in elevation, and how the buildings were preserved. (Since the ruins in Ostia were preserved by wind blown sand, it took a long time to cover the entire city. This has resulted in a sloped set of ruins. The further into the city, the higher the sand was piled, and the more the buildings were preserved)
And still, only the surfaces has been scratched.
Guess I'll keep scratching.