The ruins of the ancient town of Castrotorafe, popularly known as Zamora la Vieja, are in San Cebrian de Castro, emplacement already located in the 12th century.
It was a medieval defensive site which appeared on the banks of Esla River. It keeps the walls built with slate masonry and mortar, and has 4.709 square meters, including the castle, the hermitage and the walls.
The best preserved is the castle, of two enclosures with irregular trapezoid shape. Inside of it, practically ruined, built with different materials and with a floor similar to the outside.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.