The stairs leading to the top (and the bottom) of the tower in Ljubljana's castle
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/75062596@N00">Lars Plougmann</a> from United States
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/criminalintent/100363285/">Double helix staircase with safety bars</a>