POSTCARD N.11 - Finland
Postcrossing postcard included in Cover n. 23
Potscard image: Seafortress Suomenlinna, a UNESCO WHS near Helsinki
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World Heritage Sites always make good postcards to send or receive, such as this one hailing from Finland. Thanks a lot Nina

Suomenlinna Fortress, I read, was built by the Swedes during the 18th century, the decision to build it, having bee taken by Swedish monarch Frederik I, in 1747. The fortress is implanted on a site that is made of six interconnected islands at the entrance of Helsinki's harbor.

UNESCO declared  the fortress of Suomenlinna a World Heritage Site in 1991,  acknowledging it as  an "outstanding example of general fortification principles of the 17th and 18th centuries, notably the bastion system", as can be read in the relevant page of UNESCO's WHS portal.