If you are using Chrome, Firefox or Microsoft Edge for Windows 10 (tested on version 25.10586.0.0) explore a virtual Norman square keep.
Explore three complete floors of a Norman square keep plus a fourth gallery floor using this 3D reconstruction built using the Unity 3D game engine. Based roughly on the layout of Dover Castle explore the basement and dungeon on the ground floor.
For best results when exploring the reconstruction press 'C' to hide the mouse cursor and 'L' to go full screen. Press 'Shift' to run.
After arriving on a new floor please press 'C' again to hide the cursor. This issue hopefully will be fixed in a future version.
The reconstruction has been created using Unity 3D and employs the technology of WebGL.
You may also be interested in exploring a motte and bailey castle.