Here is a new Neighbourhood Terrain for you.
Inspired by discussion on 
it has a layout suitable for a hill fort, based loosely on the real Roman hill
fort at Segontium (Caernarvon). Read more about the real Segontium here.
The Hood has room for some outlying villages as well, but its main focus has to be the large Roman road fort. This was built on a hill with clear views all around and excellent communications to other cities and forts by the major Roman roads that join at Segontium itself.
The river Seiont's name, and that of the fort itself, derives from 'sego-' , meaning 'vigorous'. and this is a fort that is probably the most famous Roman fort in Britain; it is even mentioned in the Mabinogion.
The fort is very strategically placed for large troupe movements, at a
transport nexus for the region, between the vital northern coast road and the
west coast, on top of a broad rounded hill overlooking the Menai Strait and the Isle of
Anglesey, in the north west corner of Wales.
Archaeological excavations indicate that the fort was designed initially to accommodate a 'cohors milliaria' (a regiment of auxiliary infantry, up to 1,000
strong) but was later much reduced in size by about AD120 and once again later,
host to the First Cohort of Sunici, a 500-strong infantry regiment originally recruited from
Germany in the 3rd century, their name of the unit appears on an inscription.
Troupes were stationed there till about 400 AD.
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How to use a custom Neighbourhood Terrain