Borgholm Castle in Borgholm, Sweden, is today only a ruin of the fortress that was first built here in the second half of the 12th century and many times rebuilt in later centuries. Borgholm is a city in Kalmar County, south-eastern Sweden, located on the Island of Öland in the Baltic Sea. "Sverige" redirects here For other uses see Sweden (disambiguation and Sverige (disambiguation. This article is about ruins in Architecture; for other meanings see Ruins (disambiguation. Fortifications are Military Constructions and Buildings designed for defense in Warfare Humans have constructed defensive works for [1] It is linked to Halltorps estate, somewhat to the south. Halltorps is one of the earliest Manor houses on the island of Öland, Sweden, dating from the 11th century AD The castle was destroyed in a fire October 14, 1806. Events 1066 - Norman Conquest: Battle of Hastings - In England on Senlac Hill seven miles from Hastings, the forces Year 1806 ( MDCCCVI) was a Common year starting on Wednesday (link will display the full calendar of the Gregorian calendar (or a Common