What I'm wondering about though...is that the Golden Gate Bridge also has a marker like that. But no detailed 3D view. I wonder if it might be coming soon. If that's the case...it might be worth getting really into the map and finding locations that have markers like that, but no detailed 3D view yet, because it may mean it's coming.
In San Francisco alone...you have icons like that for Lombard Street, Grace Cathedral, Salesforce Tower, Fisherman's Wharf, the Ferry Building, and Coit Tower, to name a few. Coit Tower has a detailed model, but not to the extent that Alcatraz does. (If it were to, it would detail the fact that Coit Tower is actually on a hill).