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Segedunum was a Roman fort built at the eastern end of Hadrian's Wall (now in Wallsend, Tyne and Wear). It lay on the north bank of the River Tyne and was garrisoned c122AD-c400AD.
The fort is 138mx120m, an area of 17 hectares. It had four double gates with only the south gate opening within the Wall. The Hadrian's Wall joined to the west wall and then, from the south-east corner of the fort, a 2m wide wall ran down to the river.
For most of its history about 600 soldiers garrisoned the fort and there is evidence of a civilian vicus by the fort.
Today, the surviving foundations of many buildings and part of the Wall can be visited at the site. There is also a museum, a full-scale reconstruction of a bath house, a section of Wall and a 35 metre high viewing tower.
It is a World Heritage Site. More details can be found at Link