We have mentioned the use of stone circles in Neolithic times. During the Bronze Age they built the circle very large, sometimes twelve hundred feet in diameter, and they were sometimes made of earth. These circles are regarded by some27 as being simply burial places, and many of them have been proved to be such. But others regard them as temples, meaning thereby not a building, in our sense of the word, but a place of sanctity, and probably where some form of worship was held. Even if we allow that they were originally tombs in every case, it does not follow that they have not also been temples, for the religious sentiment has, in all ages, and in all places, tended to center in tombs, which ultimately have become places of worship. Many of our Christian Churches have originated in this manner, and it is a most obvious transition from the tomb to the temple. The worship of the spirits of the dead at the one would naturally grow into the worship of the Great Unknown in the other.28 The preceding cut is a restoration of one of the largest of these temples. Here we see a circle twelve hundred feet in diameter, of upright stones, guarded by both a ditch and embankment. From the two openings in the embankment formerly extended two long winding avenues of stone. Between them rises Silbury Hill, the largest artificial mound in Great Britain, being one hundred and thirty feet high. The area of the large inclosure was about twenty-eight and a half acres. This was a temple of no inconsiderable size. It was, of course in ruins when the earliest account of it was written, and we can only speculate as to the lapse of time since it was venerated as a place of worship.