Nice sky captured here, with the clouds rolling in. Would love to see the view from the tower :) Or is that tower only meant for prisoners or watchmen? Anyway, a good shot!
Nice perspective shot of one of the guard towers...I've actually gotten to go up into one of those many years ago (not part of the official tour) when they had slightly better structural integrity! (LOL) They're higher than they appear to be, and the view is excellent!
I visited Alcatraz about 25 years ago, but don't recall anything being in such good repair. This is a nice, clear photo, made better by knowing where it was taken. Having the tower almost in silhouette makes it look more threatening. Good job.