The Roman wall in the old town of Le Mans is one of the best of its type still extant in France. The 1300m long construction is laid out with 12 towers wraps around the immaculately preserved and restored Plantagenet Old City. There are only two longer ancient Roman walls left, in Rome and Istanbul (Constantinopole). These walls are highlighted every summer (July and August) evening in a light show that tells the history of the town.
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.