h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

On 8 April 2000 a group of volunteers for a lottery funded project tried to show how Stonehenge could have been built, 4,500 years ago.
Using only methods available at that period in history they planned to take an 8 feet tall 3 ton Blue Stone from the Preseli mountains 240 miles, around the Welsh coast and eventually toSalisbury Plain in Wiltshire.
The scheme failed after just 17 miles when the stone sank in 50 feet of water off the Pembrokeshire coast. It was recovered by divers and is now part of an exhibit at the National Botanic Gardens of Wales in Camarthenshire.
The project did prove that it was an immense task to build that monument, whatever its purpose, and even if they had used all the equipment available today it would still have been incredibly difficult.
We can only imagine the dedication and determination of those ancient builders and admire them for those qualities.