Miner's Castle, a limestone landmark, in Picture Rocks National Seashore, Michigan.
<ul><li>The location is a <a href="//commons.wikimedia.org/wiki/Category:Michigan_State_Historic_Sites" title="Category:Michigan State Historic Sites">Registered Michigan State Historic Site</a>.</li></ul>
<a href="//commons.wikimedia.org/wiki/User:FingersOnRoids" title="User:FingersOnRoids">FingersOnRoids</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>