Drag to turn · scroll to zoom · right-drag to pan · double-click the ground to centre there. Height from OS Terrain 50; vertical scale is exaggerated — see the slider.
Drag to turn, scroll or pinch to zoom, right-drag or two-finger drag to pan.
Double-click anywhere on the ground (double-tap on a touchscreen) to move the
centre of rotation to that spot, then turn and zoom around it. Zooming also follows the
pointer, so you can scroll straight into a corner of the map.
Guided tour flies a fixed route with captions. Click it again to stop.
Free orbit circles slowly around whatever you are looking at.
WHAT YOU ARE SEEING
The terrain is real, from OS Terrain 50 on a 50 m grid. Colour bands are 10 m of height.
The monuments are reconstructions placed at their surveyed positions, drawn as they might
have looked when newly built — chalk banks brilliant white, sarsens grey, timber posts dark.
Silbury Hill is modelled, not surveyed: the 50 m terrain grid is too coarse to hold it.
The vertical scale is exaggerated so the downland reads. At ×1 it is true to life.
The exaggeration applies to the monuments too, so the model stays internally consistent.