There are literally scores of pieces just lying around, some with explanations while others may be explained by the information sheets available at various points.
There are capitals, pilasters, arches, bits of mosaic and bases simply resting on the ground or in the cloisters of the monastery of the Gesuati (built around 1480).An interesting insight into the engineering genius of the Romans can be gleaned by visiting the big room (that's what it's called by the way).
There you can see an opening in the pavement and a side door allows you to see a hollow space - a cut about 18 metres deep and over 100 metres long. This was done in the tuff to prevent water infiltrations from reaching the theatre. To stop mudslides the walls were fixed with heavy wooden beams.

