From the Independent (hat tip: Rachelle Smerhy):
First evidence of Julius Caesar’s invasion of Britain discovered in Kent
His ships arrived at Pegwell Bay on the Isle of Thanet at the north east point of the county, a spot never previously suspected because it was separated from the mainland.
But the location matches Caesar’s own personal account with three clues about the landscape being consistent with the amazing discovery.
These were its visibility from the sea, the existence of a large open bay and the presence of higher ground. His army immediately constructed a fort on it.
Iron weaponry, including a javelin, and other artefacts dug up at the neighbouring hamlet of Ebbsfleet overlooking the bay suggests it was a Roman base dating to the 1st century BC.
More at the link.