There are all sorts on the Western coast of Lewis. Most are ‘blink and you’ll miss it places’ such as the unsignposted Loch an Duna Broch, the remains of which lie on a small island linked to the mainland of the loch by a ever more waterlogged causeway. Theres another one on a loch just a few miles up the road. The loch at shader, itself overlooked by the remains of a chambered cairn known as Steinicleit.
Opposite Steinicleit (which could date from 3000BC) past the loch is the huge monolith of Clach an Truseil. An absolutely huge stone which now, I was reasonably surprised to note had a picnic bench not too far away from it.