Here are a few useful links to official websites in the categories of General, Other Mapping, Museums, and Sites

General

Per Lineam Valli on Twitter

Official website for Hadrian’s Wall Country

Hadrian’s Wall Path National Trail Information about the National Trail

National Trust Hadrian’s Wall and Housesteads The Trust own Housesteads and English Heritage manage it for them

Northumberland National Park Hadrian’s Wall The Wall is in the National Park and they are one of the partners in the shop/visitor centre at Housesteads car park

Car Parking in Northumberland National Park Parking is ironically a mess along the Wall with no overall scheme that covers Cumbria, Northumberland, and Tyne & Wear, but this deals with the National Park bit

Other mapping

Some useful lidar mapping of Hadrian’s Wall (but leaving out the east end for fairly understandable reasons) by Dr Steve Malone, with an explanation here

More mapping of Hadrian’s Wall using lidar and a number of other means (which does include the east end) by Robert Langdon

Museums

The Great North Museum Wall finds from Northumberland and Tyne & Wear

Chesters Museum finds from the Clayton estate (Chesters, Carrawburgh, Housesteads, Vindolanda, Great Chesters, Carvoran)

Vindolanda Museum finds from Vindolanda (Chesterholm)

Housesteads Museum finds from Housesteads

Tullie House Museum Wall finds from Cumbria

Senhouse Roman Museum finds from Maryport

Segedunum finds from Wallsend

Sites

Hare Hill English Heritage free entry

Banks East turret English Heritage free entry

Pike Hill signal tower English Heritage free entry

Leahill and Piper Sike turrets English Heritage free entry

Birdoswald fort English Heritage entry fee

Poltross Burn milecastle English Heritage free entry

Carvoran Roman Army Museum Vindolanda Trust entry fee

Walltown Crags English Heritage free entry

Vindolanda fort Vindolanda Trust entry fee

Housesteads fort English Heritage/National Trust entry fee

Sewingshields Crags English Heritage free entry

Carrawburgh mithraeum English Heritage free entry

Black Carts turret English Heritage free entry

Chesters fort English Heritage entry fee

Brunton turret English Heritage free entry

Heddon on the Wall English Heritage free entry

Denton Hall turret English Heritage free entry

Benwell Vallum crossing English Heritage free entry

Benwell temple of Antenociticus English Heritage free entry

Wallsend fort Tyne & Wear Museums and Art Galleries entry fee