Five Sisters

From bottom to top (14miles distant):

RBS Headquarters at Gogar
Ratho (new and old)
Tormain Hill
Five Sisters Bings at Addiewell

The internet tells me these are 'formally known as Westwood Bing, the bings are post-industrial spoil heaps, the result of retorting mineral oil from deep-mined carboniferous shale beds at a time when Scotland was the major oil producing nation in the world. They tower above the naturally low-lying landscape of West Lothian'

The last spoil was heaped on them in 1962.