Borgarfjörð, the 'fjord of the borg', now West Burra Firt, was so named by the Norsemen on account of the borg (broch) or 'Pictish tower', which still stands on the little holm north of West Burra Firth pier, now greatly ruined. The broch dates to the very early 1st century AD and in the 19th century was 'connected with the land by a bridge of large stepping-stones over which the sea flows at full tide.' The diameter is 18 m and the walls are an average of 4.6 m thick. The stone still stands eight or nine courses high in places.References:
Goryōkaku (五稜郭) (literally, 'five-point fort') is a star fort in the Japanese city of Hakodate on the island of Hokkaido. The fortress was completed in 1866. It was the main fortress of the short-lived Republic of Ezo.
Goryōkaku was designed in 1855 by Takeda Ayasaburō and Jules Brunet. Their plans was based on the work of the French architect Vauban. The fortress was completed in 1866, two years before the collapse of the Tokugawa Shogunate. It is shaped like a five-pointed star. This allowed for greater numbers of gun emplacements on its walls than a traditional Japanese fortress, and reduced the number of blind spots where a cannon could not fire.
The fort was built by the Tokugawa shogunate to protect the Tsugaru Strait against a possible invasion by the Meiji government.
Goryōkaku is famous as the site of the last battle of the Boshin War.