Sandemar Castle

Sandemar Castle is a historic 17th-century estate located in Sandemar, within the Österhaninge parish of Haninge Municipality on Södertörn, Sweden. Situated along the old Dalarövägen route approximately three kilometers west of Dalarö, the structure was originally constructed during the 1670s. It stands as a rare and well-preserved example of Carolingian architecture in the region, distinguishing it from many other Swedish castles that have undergone significant alterations or fell into disrepair over the centuries. The castle's enduring physical condition offers a tangible link to the architectural trends and building practices of late 17th-century Sweden.

The property has maintained its status as a private residence throughout much of its existence and continues to function in this capacity today. Current ownership lies with Karin Mattson Nordin, who is the daughter of the prominent real estate developer John Mattson. Unlike many historical landmarks that have been converted into museums or public attractions, Sandemar Castle remains excluded from general public access, preserving its intimate character as a family home. This continuous private occupancy has likely contributed to the careful maintenance of the building's original features and overall structural integrity.

Historical records highlight the castle's involvement in notable legal and social events, including a high-profile divorce suit reported in 2009 where ownership disputes made international headlines. Despite such modern controversies, the site remains a significant cultural asset within Stockholm County. Its inclusion in lists of Swedish castles underscores its importance to local heritage. While specific details regarding its original builders or military usage are sparse in available records, its survival as an authentic period piece makes it a unique subject of interest for historians and architecture enthusiasts studying the evolution of rural estates in Sweden.