Fort Charlotte in the centre of Lerwick, Shetland, is a five-sided artillery fort, with bastions on each corner.The first incarnation of the fort was built between 1652-1653 during the First Anglo-Dutch War. Little is known of the original structure and no trace of it has been found.
The second structure was built on the same site by Robert Mylne under the orders of Charles II at the start of the Second Anglo-Dutch War in 1665 at a cost of £28,000. It held off a Dutch fleet in 1667 which thought it was far more heavily manned and gunned than it actually was. In fact, the walls were unfinished and there were few guns. At the end of the war it was slighted when the government decided not to station a garrison in Lerwick, and it was unmanned when the Dutch burnt it in 1673 during the Third Anglo-Dutch War.
It was rebuilt in its current form in 1781 and named after the wife of George III but has never seen service during hostilities since then. It housed a garrison during the Napoleonic Wars and was later a base for the Royal Naval Reserve. From 1837-75 it was used as the town jail and courthouse and later a custom house and a coastguard station.
Due to land reclamation and subsequently erected docks and buildings in front of the fort, it no longer dominates the shoreline and buildings in close proximity means the overall shape can only be seen from the air.Today Fort Charlotte is managed by Historic Scotland, and is the base for Shetland's Territorial Army. Visitors must call to get the keys to visit.
References:Trenčín Castle is relatively large renovated castle, towering on a steep limestone cliff directly above the city of Trenčín. It is a dominant feature not only of Trenčín, but also of the entire Považie region. The castle is a national monument.
History of the castle cliff dates back to the Roman Empire, what is proved by the inscription on the castle cliff proclaiming the victory of Roman legion against Germans in the year 179.
Today’s castle was probably built on the hill-fort. The first proven building on the hill was the Great Moravian rotunda from the 9th century and later there was a stone residential tower, which served to protect the Kingdom of Hungary and the western border. In the late 13th century the castle became a property of Palatine Matúš Csák, who became Mr. of Váh and Tatras.
Matúš Csák of Trenčín built a tower, still known as Matthew’s, which is a dominant determinant of the whole building.