The sprint legend took his torch to the World Heritage Site as the sun rose.
He will start the relay at 07:49 BST and it travels from Salisbury across Dorset to the fossil mecca of the Jurassic Coast
It ends up at the Olympic sailing venues of Portland and Weymouth for a boat trip into Lyme Bay.
A total of 116 runners will carry the torch on a 107-mile route.
After an early start to the day at the ancient stones – scene of a fire garden Cultural Olympiad event on Tuesday – the torch will travel back to Salisbury, where the world 400m record holder and four-times Olympic gold medal winner will set off the relay from Cathedral Green.
The convoy goes from Salisbury to Wilton then through the Wiltshire villages of Barford St Martin, Fovant and Ludwell, where it will pass the famous chalk regimental badges cut into the hillside.
Source Link: http://www.bbc.co.uk/news/uk-18802568
Merlin @ Stonehenge