Alcatraz Island as seen from the East. The small island in the San Francisco Bay was developed with facilities for a lighthouse, a military fortification, and a prison. It received designation as a National Historic Landmark in 1986.
<a href="//commons.wikimedia.org/wiki/User:Frank_Schulenburg" title="User:Frank Schulenburg">Frank Schulenburg</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>