Uspenski Cathedral is an Eastern Orthodox cathedral dedicated to the Dormition of the Theotokos (the Virgin Mary). The cathedral was designed by the Russian architect Alexey Gornostaev (1808–1862), but it was built after his death in 1862-1868. It was made of bricks brought mainly from Bomarsund fortress in Åland which had been destroyed during the Crimean War in 1854.
Uspenski cathedral represents the Slavonic architecture, but the interior has a strong Byzantine influence. The cathedral has also several valuable icons. With its golden cupolas and redbrick facade, the cathedral is one of the clearest symbols of the Russian impact on Finnish history. It’s very popular tourist attraction with half million annual visits.
First record of Kastelholma (or Kastelholm) castle is from the year 1388 in the contract of Queen Margaret I of Denmark, where a large portion of the inheritance of Bo Jonsson Grip was given to the queen. The heyday of the castle was in the 15th and 16th centuries when it was administrated by Danish and Swedish kings and stewards of the realms. Kastelhoma was expanded and enhanced several times.
In the end of 16th century castle was owned by the previous queen Catherine Jagellon (Stenbock), an enemy of the King of Sweden Eric XIV. King Eric conquered Kastelholma in 1599 and all defending officers were taken to Turku and executed. The castle was damaged under the siege and it took 30 years to renovate it.
In 1634 Åland was joined with the County of Åbo and Björneborg and Kastelholma lost its administrative status.