Geograph - photograph every grid square

The left side incorporates the ruins of a medieval fortified tower. It was occupied by the Earls of Athol in C14th (their story is here Link ), was raided by the Scots in 1388, and rebuilt in the C17th. It fell into ruins and was roofless until 1935, when it was restored and built into the inn Link (Archive Link )
Newcastle Libraries has a photo from c1910 here Link

There is said to be a hidden tunnel starting behind the fireplace, in the tunnel room of the Inn, to either St Mary's Church on the opposite side of North Street or to the Vicar's Pele. The place has a long history and there are undoubtedly a few skeletons in the cupboards.
Before the castle, the site was a knoll in the marshes, thought to be the location of the signing of a peace treaty between Henry III of England and Alexander of Scotland in 1242. At the negotiations a marriage was planned between Alexander's eldest son and Henry's eldest daughter, although they were only aged 3 and 4 respectively at the time.
Link (Archive Link )

The Blackbird Inn is a Grade II* Listed Building (List Entry Number: 1042690): Link
Ponteland Castle on Gatehouse: Link