Lawrence, you are absolutely right! From 0:48 - 0:56 that is not Castillo de San Marco. I used to live in that vicinity and some of the footage is mine and some is stock footage. I'm so sorry to have included the wrong footage. As soon as I figure out where this is, I'll make a correction to the video. A little further along, I show an image of Fort of Saint Nicholas in Greece but that was intentional as I was discussing coquina construction. At any rate, thank you so much for calling this to my attention. I'll be more careful in the future. Oh, and thanks for watching!
**Correction** The footage from 0:48 - 0:56 is not Castillo de San Marco in St. Augustine, FL. Rather, it is the UNESCO world heritage site of Akko, Israel. I apologize for the error and appreciate your understanding and I thank you for watching!