| Period | Monarch | Major Works |
| 1078-1097 | William I | White Tower (keep) — Norman stone fortress, 27m high, 4.6m walls |
| 1190-1210 | Richard I / John | Inner curtain wall, Bell Tower, Wardrobe Tower |
| 1216-1272 | Henry III | Great Hall, Wakefield Tower, Lanthorn Tower; royal palace expansion |
| 1272-1307 | Edward I | Outer curtain wall, moat expansion, St. Thomas's Tower (Traitor's Gate), Beauchamp Tower |
| 1307-1377 | Edward II/III | Devereux Tower, Martin Tower, Brick Tower, residential improvements |
| 1485-1509 | Henry VII | Bloody Tower (Garden Tower), Henry VII Chapel (planned) |
| 1509-1547 | Henry VIII | Tower Wharf, Timber wharves, palace refurbishment, Anne Boleyn lodgings |
| 1558-1603 | Elizabeth I | Queen's House (King's House), armory expansion |
| 1660-1685 | Charles II | Post-Civil War repairs, Ordnance Office buildings |
| 1714-1727 | George I | Waterloo Block (barracks), Grand Storehouse |
| 1826-1843 | George IV / William IV | Major restoration (Anthony Salvin, John Taylor) — medieval appearance revived |
| 1845-1858 | Victoria | Waterloo Barracks (now Crown Jewels), Fusilier Museum |
| 1923-present | — | Public museum, UNESCO WHS (1988), conservation ongoing |
Key Structures & Functions
- White Tower: Keep, royal residence, chapel (St. John), armory
- Inner Ward: 13 towers (Bloody, Beauchamp, Bell, etc.)
- Outer Ward: 6 towers + Moat (drained 1843)
- Traitor's Gate: Water entrance for prisoners
- Chapel of St. Peter ad Vincula: Burial site (Anne Boleyn, Catherine Howard, Jane Grey)
Evolution of Purpose
- Norman fortress (domination of London)
- Royal palace (residence, ceremonies)
- State prison (high-status prisoners)
- Armory/Mint/Menagerie/Record Office (state functions)
- Tourist attraction (since 1660s, formalized 19th c.)
Visiting Today
- Yeoman Warder (Beefeater) tours
- Crown Jewels in Waterloo Barracks
- White Tower (Royal Armouries)
- Medieval Palace rooms
- Wall walk (partial)
The Tower is a palimpsest of English history—each layer reflecting the monarchy's evolving needs: defense, residence, administration, symbolism.