One of my favourite ancient artefacts in that area is the Tap o' Noth - a large vitrified fort - the rocks making up the huge walls apparently having been intentionally melted:
http://canmore.rcahms.gov.uk/en/site/17169/details/tap+o+not...
http://en.wikipedia.org/wiki/Tap_o%27_Noth
The Tap formed my own mental image of Tolkien's Weathertop :-)