According to ancient texts, Binicodrell was a large Talayotic period settlement (1000-700 B.C.). Today, only two talayots remain, of which the northern one is in a better condition; it has a zigzag shaped access ramp leading inside, although researchers disagree on whether it was built at the same time as the talayot. The southern talayot, on the other hand, is quite dilapidated.You can still find fragments of pottery on the ground, dating from various eras: Talayotic, late Punic, Roman and Islamic. Inside the protected area of the site there is a necropolis.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.