Ramparts and moat at Kastellet in Copenhagen, Denmark
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/mulmatsherm/">C Jill Reed</a>
CC BY-SA 2.0
<a rel="nofollow" class="external free" href="https://www.flickr.com/photos/mulmatsherm/3154067467/sizes/o/in/photostream/">https://www.flickr.com/photos/mulmatsherm/3154067467/sizes/o/in/photostream/</a>