A complex near this edifice contains one of the northernmost examples of Reihentyp construction. Colored pulses illuminated six-foot-wide balloons during the 2012 Connecting Light installation on this structure. Mysterious circular huts near this structure may have housed families of prisoners, and the Chesters Bridge helped supply it. John Clayton helped prevent the repurposing of stones from this structure, which is positioned atop the Whin Sill's cliffs. Circular apses remain in the ruins of a [*] bathhouse at Vindolanda, where the Stanegate crossed this edifice north of the River Tyne. Its milecastles were often irregularly spaced, and a similar structure to its 
A complex near this edifice contains one of the northernmost examples of Reihentyp construction. Colored pulses illuminated six-foot-wide balloons during the 2012 Connecting Light installation on this structure. Mysterious circular huts near this structure may have housed families of prisoners, and the Chesters Bridge helped supply it. John Clayton helped prevent the repurposing of stones from this structure, which is positioned atop the Whin Sill's cliffs. Circular apses remain in the ruins of a [*] bathhouse at Vindolanda, where the Stanegate crossed this edifice north of the River Tyne. Its milecastles were often irregularly spaced, and a similar structure to its north, named for Antoninus Pius, replaced it as the frontier between Caledonia and Britannia until legionaries re-garrisoned it. For 10 points, name this Roman defensive fortification in the north of England.
A complex near this edifice contains one of the northernmost examples of Reihentyp construction.
Hadrian's Wall [or Vallum Aelium]