Utö hus, Medieval castle on Arnö Island in Lake Mälaren, Sweden.
The rectangular stone structure features crow-stepped gables, two main floors, two attic levels, and a cellar with a high-positioned entrance point.
The castle was constructed in the 15th century for the Schack family and later merged with Grönsöö Manor in the 1630s through Johan Skytte's marriage.
The building represents Swedish medieval noble estates and post-reformation fiefdoms, with seven rooms on the ground floor maintaining their 17th-century layout.
The Royal Swedish Academy of Letters manages the property since 1937, when Alice von Ehrenheim donated the structure for preservation purposes.
Located on both sides of Grönsösundet, Utö hus and Grönsöö Castle demonstrate the strategic control of Mälaren's waterways during medieval times.
GPS coordinates: 59.47304,17.23223
Latest update: March 3, 2025 23:28
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