Near Pooley Bridge
From the summit of Hallin Fell some three and a half miles to the South, Dunmallard Hill can clearly be seen at the Northern tip of Ullswater. This is a spectacular tree covered multivallate hill fort with an enclosure at the very top. This defended enclosure measures around 92 by 39 metres, and is surrounded by a stone faced bank some three metres high and nine metres wide.There is also a ditch, one metre deep and nine metres wide.
Above. Close up of Dunmallard Hill from Hallin Fell.
There are records regarding a tower somewhere in the vicinity of Dunmallard Hill, but there is no archaeological evidence to suggest that this tower, dated from around 1317, would have been situated at the summit of this hill fort.
Above. Dunmallard Hill at the Northern tip of Ullswater.
Check this link for some photos of the foot of the mound.
Check this link for some photos of the fort and Maiden Castle.
And of course, some information and photos from Julian Copes' The Modern Antiquarian.