In the modern era, it probably is just gathering precise positioning for a missile launch. I expect some computer wiping will be in the cards too. That might

In the modern era, it probably is just gathering precise positioning for a missile launch. I expect some computer wiping will be in the cards too. That might be the modern version of rigging the buildings already. Given what a strategic asset they are, I would expect its not really "conspiracy level stuff" on various plans. After all, the US had attack plans for the UK between the world wars.