The Imatrankoski Rapids has been a famous tourist sight since the 18th century. For example Catherine the Great, the Empress of All the Russias, visited Imatra in July 1772. In 1892 the railway came to Imatra, which immediately shortened the journey from St. Petersburg and increased the influx of tourists. There were originally two wooden hotels used by Russian aristocracy, but but they had been destroyed in fires in the beginning of the 20th century.
The Grand Hotel Cascade d'Imatra (Valtionhotelli in Finnish) was opened in 1903. The huge jugend style castel hotel was designed by Usko Nyström and it represents the romantic medieval knight castle style (like the Neuschwanstein castle in Germany).
After Finland's independence in 1917, the Russians found themselves barred from crossing the border and the remote location of the Imatrankoski Rapids near the Russian border no longer held any attraction to Finnish tourists. The 1920s saw the construction of the Imatrankoski power station; after that, the rapids were allowed to surge free only for special shows.
Valtionhotelli was renovated to the original outfit in 1987. Today it functions as a Spa Hotel owned by Restel Oy.
Reference: Imatra Municipality
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.