Dating back as early as the 13th century, this late medieval building is the oldest remaining parliamentary court still in use today. It was first built as a castle and home to the various counts of Holland, but after several battles for succession, the Binnenhof changed hands many times and, in the process, saw many new administrative buildings erected around it. Extensive renovations are currently underway and not expected to finish before 2028, so politicians have had to find elsewhere to conduct their business. Tours of the surrounding areas are available and more information can be obtained at the Binnenhof Renovation Information Centre, which is right next to the complex.

Built on the mouth of the Colligan river in the 12th century, the Anglo-Norman Castle of King John is an important landmark in Irish history: it served as a barracks in the 18th century, and was at the forefront of battles during the Irish Civil War, when it was almost completely destroyed.

One of the oldest lighthouses in the world, this 800-year old structure is home to a visitor's centre, a gift shop, as well as various festivals such as the Maritime Matters Festival on the May bank holiday weekend or the Pirate Festival in July.