Deal Castle is entered through the gatehouse, which originally overlooked a walled garden, since largely destroyed.[77] The dry, stone-lined moat, 20 metres (66 ft) wide and 5 metres (16 ft) deep, would originally have been crossed over a stone causeway and a drawbridge, the latter now replaced by a modern wooden bridge.[78] The gatehouse still has its original iron-studded doors – the historian Jonathan Coad considers them "among the best preserved for their date" – and five murder-holes to enable the garrison to defend the internal passageway with missiles or handguns; it would originally have also been protected by a portcullis at the entrance.[79] The outer bastions were filled with earth in the 1570s, and have 18th-century ramparts; the superstructure around the eastern bastion was rebuilt after the Second World War.[80] A passageway called "the Rounds" runs along the outside of the outer bastions, linking the handgun positions covering the base of the moat.[81]