Adam Clarke on Psalms 48:13

Mark ye well her bulwarks - See the redoubts by which she is defended.

Consider her palaces - See her courts, chambers, altars, etc., etc.; make an exact register of the whole, that ye may have to tell to your children how Jerusalem was built in troublesome times; how God restored you; and how he put it into the hearts of the heathen to assist to build, beautify, and adorn the temple of our God.