The sea fortress of Svartholma, located at the entrance to Bay of Loviisa, is a sister fortress to Suomenlinna in Helsinki. They belong to the same defence chain of fortresses. The construction of Svartholma started in 1748 according to plans made by Colonel Augustin Ehrensvärd. Most of the work was carried out in the 1750s.
The Swedish command ended in 1808 when Svartholma surrendered almost without resistance to Russia. During the Crimean War in 1855 an English squadron blasted the fortress and it was left as it was. Starting in the 1960s, it has been restored under the supervision of the National Board of Antiquities.
Svartholma is a popular visiting destination for the whole family. You can get there on your own boat as well as on booked or scheduled boat services. Guided walking tours are available on the island. Free berths, exhauster for septic tanks, waste points and campfire sites are available for guests.