thumb|Stonehenge in Wiltshire is a ring of stones, each about high, wide and 25 tonnes, erected 2400–2200 BC. Settlement by Cro-Magnons of what was to become the United Kingdom occurred in waves beginning by about 30,000 years ago."Ancient skeleton was 'even older' ". BBC News. 30 October 2007. Retrieved 27 April 2011. The island has been continuously inhabited only since the last retreat of the ice around 11,500 years ago. By the end of the region's prehistoric period, the population is thought to have belonged largely to a culture termed Insular Celtic, comprising Brittonic Britain and Gaelic Ireland. alt=Photograph of the Baths showing a rectangular area of greenish water surrounded by yellow stone buildings with pillars. In the background is the tower of the abbey.|thumb|The Roman Baths in Bath, Somerset, are a well-preserved thermae from Roman Britain.
thumb|Stonehenge in Wiltshire is a ring of stones, each about high, wide and 25 tonnes, erected 2400–2200 BC. Settlement by Cro-Magnons of what was to become the United Kingdom occurred in waves beginning by about 30,000 years ago."Ancient skeleton was 'even older' ". BBC News. 30 October 2007. Retrieved 27 April 2011. The island has been c,ontinuously inhabited only since the last retreat of the ice around 11500 years ago. By the end of the region's prehistoric period, the population is thought to have belonged largely to a culture termed Insular Celtic comprising Brittonic Britain and Gaelic Ireland. alt=Photograph of the Baths showing a rectangular area of greenish water surrounded by yellow stone buildings with pillars. In ,the background is the tower of the abbey.|thumb|The Roman Baths in Bath, Somerset, are a well-preserved thermae from Roman Britain.