The postal and communication museum Enigma at Øster Allé in Østerbro in Copenhagen. The red building was build as a post office in 1922 while the green extension was build in 1978. The first part of the museum opened in the red building in 2017 and the museum as a whole in 2023.
<a href="//commons.wikimedia.org/wiki/User:Dannebrog_Spy" title="User:Dannebrog Spy">Leif Jørgensen</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>