Observation bunker 74:43 at Grogarnsberget, Östergarns socken, Gotland, Sweden. 6 x 5 meters (NNE-SSW) and up to 2 meters high. Entrance to SSW. Molded concrete. See also <a rel="nofollow" class="external text" href="http://www.tjelvar.se/anl/74-43.htm">this link</a>.
<a href="//commons.wikimedia.org/wiki/User:DivadH" title="User:DivadH">David Haskiya</a>
<span class="int-own-work" lang="en">Own work</span>