Each of these features, taken by itself, is specially remarkable, and the presence in the one building of such a group of features that are wholly unfamiliar to us invests it with a character that is distinctly peculiar. From this examination of its character, it becomes obvious that although the construction and arrangements of the building are clearly those of a place of strength, it is incapable of association by way of relationship with any variety of castle known in historic times. But a wider survey of the remains of the ancient strongholds of the people who have occupied the land in times of which we have no distinct or detailed historic record will show that it has relationships so close as to amount to an almost actual identity with many similar structures in different parts of Scotland. [Illustration: Fig. 163.—View of external aperture of doorway of Broch in Glenbeg. (From a Drawing by J. Romilly Allen.)] [Illustration: Figs. 164, 165.—Ground plan and section of elevation of doorway and passages through the wall of Broch in Glenbeg. (Drawn by J. Romilly Allen.)] For instance, in the small valley of Glenbeg, which runs nearly parallel with Glenelg, in the west of Inverness-shire, there are two such structures. One is situated on the edge of the meadow which lies in the bottom of the valley. It is greatly destroyed; more than half the circle of the wall is gone, and part of the height of the portion that remains is wanting. The internal diameter of the tower, at the level of the rubbish which encumbers the floor, is 33½ feet, and the thickness of the wall 11 feet. The doorway (Fig. 163), which is the only opening to the outside, is 3 feet 5 inches wide at the head, the lower part concealed with rubbish. About 4 feet inside the outer plane of the wall there is a rebate for a door (Fig. 164), with checks in the shape of large slabs set edgewise in the wall. Within these checks the passage widens to 5 feet, and the roof rises as shown in the section, Fig. 165. On the south side of the passage there is a guard-chamber opening from it, and constructed in the thickness of the wall. Three galleries and part of a fourth remain, but the stair is gone. The galleries are lighted by vertical ranges of windows looking to the interior. The greatest height of wall remaining is not over 30 feet, but 7 feet of its height were taken by the contractor for the Bernera Barracks in 1722. It must therefore, before that time, have been nearly as high as Mousa now is. [Illustration: Fig. 166.—Section of the elevation of Broch in Glenbeg, near Glenelg. (From Plan by Sir H. Dryden.)]