Velthur tells me he will be taking some photographs tomorrow, and will mail some to me. I will digitise them and post them here as soon as available. The material used for the construction blocks is the characteristic Central Etrurian Limestone extracted from local quarries. Significant remains of the central doorway can only be found in one location on the north side. The other 4 are of questionable locations.
Traces remain of the ancient walls scattered in the perimeter.
We could not find a study of merit that has supplied exact figures, but it can be estimated at approximately 1000 m. Of these perhaps only one worthwhile section more than 100 m exceeds a height of 3 m. These are situated on the north side and still preserved is the remains of the Gateway which was constructed according to advanced Military Engineering principles. In fact on the subject of skill, the walls are not of rectilinear construction, but they form a curvilinear shelf that overhangs in order to protect their left side, from direct attack. The general impression is that all this was highly effective. Considering also the large population of defenders, it would have been extremely difficult to take by force.