Open to visitorsa Historic Environment Scotland site — many are free to wander; staffed ones charge and keep set hours
Substantial ruinsruined, but plenty survives above ground
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Greenknowe Tower, Gordon is one of two tower houses the Albion Guide lists in Scottish Borders. The site is in the care of Historic Environment Scotland. For more of the same, Hume Castle and Smailholm Tower are close by. The nearest railway station is Tweedbank, 14 km to the south-west.