St. Jacob's church is easy to recognise from a distance as it has four spherical globes on the tower's helm edge. The three-naved Gothic brick hall church (built in 1334) has been the church of seafarers since the Middle Ages. It was consecrated together with St. Mary's and St. Peter's. Since the church did not suffer any damage during the 2nd World War, the boxed pew and historic organ are still intact. The small 'Stellwagen organ' is one of the best preserved examples of North German organs from the 16th century.
A lifeboat commemorates the sinking of the four-masted barque 'Pamir' in 1957. It is located in the north tower chapel and represents the 'National Memorial for Civilian Shipping' today.
St. Jacob's is a memorial site for international seafarers and placed in its vault beneath the Pamir chapel, which serves as a Columbarium (a place of memory), are the urns of those whose lives were intertwined with the sea. An ensemble of three-storey brick eaves houses built in 1601 stands in front of St. Jacob's. These served as residences for the pastors and preachers of St. Jacob's Church.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.