Adam Clarke on Mark 13:1

See what manner of stones - Josephus says, Ant. b. xv. chap. 11: "That these stones were white and strong, Fifty feet long, Twenty-Four broad, and Sixteen in thickness." If this account can be relied on, well might the disciples be struck with wonder at such a superb edifice, and formed by such immense stones! The principal contents of this chapter are largely explained in the notes on Matt. 24, and to these the reader is requested to refer.