Which Roman wall can be visited in the North of England?

Hadrian's Wall is the correct answer because it is a significant historical structure built by the Romans in the north of England during the rule of Emperor Hadrian, around AD 122. Spanning approximately 73 miles across northern England, it was designed to protect the Roman frontier from the tribes in what is now Scotland and to control the movement between the Roman territories and the north. Today, it is a UNESCO World Heritage Site and attracts many visitors who wish to explore its remains and experience the stunning landscapes of the area.

The other walls mentioned do not pertain to northern England. The Wall of Antonine, while also a Roman construction, is located further north than Hadrian's Wall and is less well-preserved. The London Wall relates to the defenses of ancient Londinium but is in the south of England. The Great Wall of China, although an impressive feat of engineering and cultural significance, is located in China and is unrelated to Roman constructions in Britain.