Skovsbo traces its history back to the 14th century. The castle seen today was built from 1572 to 1579 for privy councillor Erik Hardenberg (1534-1604). Built in the Renaissance style, with Dutch gables, Skovsbo consists of two floors over a vaulted basement and an octagonal staircase tower with a spire to the west. An appendix in the south-eastern corner, with a second staircase, dates from the original house while another appendix built to a similar design at the north-eastern corner was added in 1891 by the architect August Klein(1839-1902). The estate covers 183 hectares of land. It is privately owned.
Across the road from Skovsbo stands a roadside crucifix which was installed in about 1600 by Anna Rønnow, the wife of Erik Hardenberg, who unlike her husband was a Catholic. It is the second oldest roadside crucifix in Denmark, second only to the Crucifix of Holy Anders near Slagelse.References:
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.