Our next stop was to the city of Donegal, the seat of power for the Celtic kingdom of the O'Donnells. We took a tour through Donegal castle. My first time inside a European medieval castle. The stone and woodwork were highly impressive. It is a true castle in the sense that it was designed for war, not just an administrative center. The stairway to the upper levels was constructed to trip attackers making them vulnerable to the weapons of the defenders. Occupation of the site passed from Norman to Irish to British and can be seen in successive construction in differing styles around the keep. The reasons that different cultures would settle in the same areas were often simple. Often the reason was access to water such as a river or lake. Other times it was access to a resource like stone or wood. More often than not it was because of a strategic importance like hill tops for defense or control of the surrounding area. For sites that had spiritual significance the adoption of the site by successive groups was a type of cultural appropriation that allowed for assimilation of the population.