Military sites in Essex no longer standing
| Asheldham Ancient Britons Camp | 4000 BC | |
| Bradwell on Sea Othona Roman Fort | ||
| Burnham on Crouch RNAS Airfield | WW1 | |
| Danish Invasion | 899 - 1016 | |
| Dutch Invasion | 1667 | |
| Napoleonic Wars | 1793 - 1815 | |
| Royal Observer Corps Underground Monitoring Posts | 1959-1990 | |
| Thames Barges at War | WW1 & WW2 | |
| World War Two Pillboxes | WW2 |


