All the castles and fortifications that can be accessed from the maps are listed here.
| Oakham | Old Bolingbroke | Oxburgh Hall |
| Odiham | Old Sarum | Oxford |
| Ogmore | Old Wardour | Oxwich |
| Okehampton | Orford | Oystermouth |
| Queenborough |
| Raby | Richard's Castle | Rockingham |
| Raglan | Richborough | Rose |
| Reculver | Richmond | Rowlands Castle |
| Redcliff Battery | Ripley | Ruthin |
| Restormel | Roch | Rye |
| Rhuddlan | Rochester |
| Tamworth | Tilbury Fort | Tower of London |
| Tattershall | Tintagel | Trematon |
| Taunton | Titchfield Abbey | Tretower |
| Tenby | Tiverton | Tutbury |
| Thornbury | Tonbridge | Tynemouth |
| Tickhill | Totnes |
| Upnor | Usk |
| Yanwath | Yaverland Battery | York |
| Yarmouth |