English Heritage & National Trust
Fragments of the wall remain at various places along its 71-mile length. However the most substantial remains are in the uplands where it was most difficult to rob the wall for purposes such as road-building, farm buildings and field walls. To the disgust of antiquaries, a lot of the wall disappeared when a military road was built alongside it in the 18th century.
At Housesteads, sections of wall remain to a height of several feet, and the complete outline and foundations of a Roman wall fort can be seen. The land is now owned by the National Trust. There is a National Trust building beside the car park, and a English Heritage museum and ticket office near the fort and wall, about half a mile up the hill.
It’s well worth making the effort to visit the site (unless it’s pouring with rain, as it was during my visit). While travelling there, look out for the vast Roman ditch systems alongside the road that runs parallel to the Wall. Two more forts, walks, and a view-point are within a few miles, making the area a candidate for an all-day visit.