The Barra Isles have been inhabited since the Neolithic period, the oldest sites dating back to around 3,600 BC. Many sites have been excavated on Barra and vatersay – chambered tombs and standing stones. In the late Neolithic and Bronze Ages (3,000 to 1,000 BC), more tombs, burial cairns and earthworks have been identified.
For more information, please follow this link http://www.isleofbarra.com/for-visitors/barra/archaeological-sites.html
In 2007, the Channel 4 Time Team visited Barra and uncovered a wheel-house dating to around 1,000 BC, a slightly later round-house and 2 cyst graves (one containing a perfect specimen of a female skeleton 3,000 years old.