A Castle Built in Layers
Dover Castle is not one building but a series of structures accumulated over two millennia, each layer added by a different era responding to a different threat. Walking the site from the outer perimeter inward is to walk through 2,000 years of military engineering — Roman brick, Norman flint, Plantagenet dressed stone, Victorian brick, and 20th-century concrete all within a few hundred metres of each other. The site covers approximately 34 acres, making it one of the largest castle complexes in England.
The Great Tower (Keep)
The Great Tower stands at the heart of the castle. Built by Henry II between 1181 and 1188, it rises 83 feet and has walls up to 21 feet thick at the base. The tower has four storeys, with principal state apartments on the second and third floors. The interior has been restored to its late 12th-century appearance, with richly coloured walls, replica furnishings, and hologram figures of Henry II and his court in the great hall, private chambers, chapel, and kitchen. The roof offers panoramic views across the castle, Dover, the harbour, and — on clear days — the French coast.
The Great Tower's staircase and several subsidiary rooms are built entirely within the wall thickness itself. Henry II insisted on a water supply that could not be cut off during a siege — the well shaft descends through the wall to chalk aquifers below.
The Inner Bailey and Curtain Walls
Surrounding the Great Tower, the inner bailey is defined by a ring of curtain walls with rectangular mural towers projecting outward. Built by Henry II alongside the Great Tower, these represent one of the earliest systematic uses of rectangular mural towers in English castle design. Notable features within the inner ward include the Avranches Tower, the Constable's Gate (a 13th-century gatehouse), and the Palace Gate. A second well within the inner bailey provided additional water security.
The Outer Bailey and Outer Curtain Walls
A second ring of defensive walls — the outer curtain — encloses a much larger area. Built under King John and Henry III in the late 12th and early 13th centuries following the near-breach in the 1216 siege, these walls are punctuated by D-shaped towers that allowed defenders to fire along the wall face — a significant tactical advance over the inner ring's square towers. The outer curtain encloses the Roman Pharos, the Saxon church, the Spur earthwork, and the main visitor entrance.
The Roman Pharos (Lighthouse)
Standing in the inner ward beside the church of St Mary in Castro, the Roman Pharos dates from approximately AD 50. It originally stood six storeys high; four survive to a height of around 40 feet — one of the tallest Roman structures in Britain. The upper two storeys were rebuilt in the medieval period and served as the church's bell tower. The Roman construction uses alternating courses of imported tufa (volcanic stone) and local flint, bonded with distinctive pink Roman cement — clearly visible on the exterior.
St Mary in Castro
The Saxon church immediately beside the Pharos dates from the late 10th or early 11th century and is still used for services. It is built largely from Roman materials recycled from earlier structures on the site; Roman brick is clearly visible in the walls. The church was substantially restored in the 19th century by William Butterfield.
The Secret Wartime Tunnels
Below the cliff face, at three distinct levels, lies the tunnel network that is Dover's most historically significant space. The uppermost level (Annexe) was carved in the 1790s for Napoleonic-era troop accommodation. The middle level (Casemate) was equipped in the Second World War as Vice-Admiral Ramsay's combined operations headquarters. The lowest level (Dumpy) was extended in the Cold War as a Regional Seat of Government bunker.
The Casemate level is the most fully interpreted. Visitors walk through the Operations Room where Dynamo was directed, the communications centre, the hospital tunnel, and a viewpoint window cut directly into the cliff face — the window through which Ramsay watched the evacuation. The tunnel tour is guided, takes approximately 45 minutes, and is included in standard Dover Castle admission.
Plan your visit in this order: Secret Wartime Tunnels first (tours fill up), then the Great Tower, then the outer walls and Roman Pharos. Check the tunnel tour timetable at the main entrance when you arrive, or book a guided Dover Castle tour from London to have timing managed for you.
The Spur and Earthworks
On the north side of the castle, the Spur — a triangular earthwork projection added in the early 19th century — extended the defensive perimeter down the slope and provided artillery platforms covering the approach from the town. A new viewpoint at the Spur now provides the best photograph of the full castle with the White Cliffs as backdrop.
For ticket prices and opening hours, see our Visitor Information page. To book a Dover Castle guided tour from London, see the tour listings on the homepage.