I came across this excellently produced animated illustration of a Roman castra, or fort, today as I was researching fortress layouts. This imagery represents the Roman fort at Templeborough, which, according to Wikipedia, was first built in timber between 43 and 68 AD and later upgraded to stone construction.

It appears to have been home base for a Gallic cohort, Cohors IV Gallorum, during the late 1^st or early 2^nd centuries. Its use for a cohort would make it a smaller scale fort, presumably less than 6 hectares. I am not personally familiar with the site, so comments and additional information from readers in the know is welcomed.