Colin Riegels on Wikimedia Commons The entrenchment is part of a British city built in the 1st century BC. It was probably here that Julius Caesar defeated the British king Cassivellaunus in 54 BC Devil's Dyke, Wheathampstead Colour: stone Wikimedia: Flickr: Google Streetview OpenStreetMap See also... Neddyseagoon on Wikimedia Commons Matt Brown on Flickr