Langwell Castle (1)
This is the site of Langwell Castle, more anciently known as Achastle.  Not much remains visible, because (a) there's not much of it anyway, and (b) because such as there is, is covered in turf and bracken. 

The castle was positioned on the end of a ridge, formed by the confluence of the Langwell Water to the south, and the Berriedale Water to the north.  These two rivers have carved deep valleys, which the A9, visible in the distance, has to drop right down into and then climb back out of on its way north to Caithness.  The intervening ridge, starting at the wall and line of trees in the background, drops 200 feet to the combined valley floor, which of course provided admirable protection to the east and south sides of the castle while allowing the occupants to keep an eye on anyone moving along the coast.
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