at , close to the River Thames, and good views can be had from the Thames Path along the river. The panoramic views of the Berkshire and Oxfordshire countryside from the Clumps themselves are also spectacular; a viewpoint guide on the north side of Round Hill gives directions to many sights, the furthest being Faringdon Folly, a tower built on another Iron Age hillfort to the west. Day's Lock and Dorchester Abbey are clearly visible in the valley to the north, with the 15-storey Plowman Tower in Northway, Oxford visible on the horizon, away. The white-walled reactor buildings of the Joint European Torus, site of the world's first successful controlled nuclear fusion experiments, can be seen around 6 km to the north-west. To the west, there is the town of Didcot, with some of the chimneys of the gas-fired Didcot B Power Station visible. Formerly, the cooling towers of Didcot A Power Station, constructed in the late 1960s, dominated the skyline around Didcot; they were demolished in phases from 2014 to 2020. To the north-east is Little Wittenham Wood, which borders the Thames, and to the south-east is Brightwell Barrow. The wooded area at the top of Castle Hill, which contains a public footpath, is now closed indefinitely due to the danger of falling trees. The entrance to the wooded area atop Round Hill also carries a warning of falling branches due to fungal decay of many of its trees. Archaeology There is a hillfort on Castle Hill. The earliest earthworks date to the late Bronze Age. More banks and ditches were added during the early Iron Age. Excavation has revealed that the Iron Age inhabitants caught fish and wild boar as well as herding cattle and sheep. There is also evidence of cultivation of barley and wheat. The fort appears to have been abandoned by the late Iron Age, the next occupants being Romans. A 2004 episode of the Channel 4 archaeological television programme Time Team focused on the Clumps. In 2004 Castle Hill was under excavation by Oxford Archaeology, and Time Team was charged with investigating the surrounding landscape to find any trace of activity that could be associated with the Clumps. Over a period of three days, Time Team surveyed a total of seven hectares using ground-penetrating radar. The original focus was the previously unexplored Round Hill, but difficulties in carrying out geophysical studies on its tree-covered