The remains of Hirendean Castle lie at about 340 metres (1100 feet) beside the infant South Esk river in the Moorfoot hills. A book written in 1908 states that it was inhabited within living memory although it is almost completely ruined now. Only the south wall and a fragment of the west gable remain, showing that the building had at least three storeys but it is in a very bad state with the upper part of the 30 foot high wall threatening to fall.  It was believed to have been built before 1620 and probably used as a hunting lodge for the Earls of Lothian.  The views towards Gladhouse Reservoir (which we then walked around) and to the north are quite extensive although it was a little misty and the wind felt icy.