I hate to say it but this is completely wrong

http://www.sciencedaily.com/releases/2010/11/101130010931.htm
If it were true they’d be many maybe hundreds of the small stone balls in and around Stonehenge. But none have been found as far as Im aware. And these balls are carved, if they were used as some sort of new stone age railway they would be smooth. Where they are found is where there are also the so called cup stones. There is no cup stone at Stonehenge, the cup stones are found in the north and in Scotland and a few other places, its know that the stone circles there were orientated for moon worship. It makes sense to me that the two are connected. The small stone balls represent the moon, and they would be used to place in the carved depressions the ‘cups’ maybe to mark full moons, but certainly to be used in moon worshiping ceremony’s. Many of the cups have concentrically carved lines around them, like mazes,
maybe representing the path that religious ceremony’s would have taken.