You can see everything there is from the pictures. There are plenty of other interesting rocks to look at in Asuka so it is nothing exceptional. Have a look if you're passing by or have some spare time but it's not worth going well out of your way for.

Like most of the ancient stones in Asuka (and there's plenty!), scholars can only guess at what they were and what they were used for. There is an ancient legend associated with it. The stone currently faces south, but it originally faced east and should it ever turn to face the west, the whole of Japan will be reduced to a sea of mud! I found it fascinating that this megalith is just sitting out next to some guy's field as open to interpretation as scripture.