Glenbuchat Castle is a historic Z plan Scottish castle built in 1590 for John Gordon of Cairnbarrow to mark his wedding. It is located above the River Don, near Kildrummy, Aberdeenshire. The building is roofless, but otherwise in fairly good repair.
The family sold the castle in 1738, and it remained in private hands until the 20th century. James William Barclay bought the castle in 1901, and Colonel James Barclay Milne, his grandson, placed it in state care in 1946. A local club purchased the surrounding parkland in 1948 and gave it to the state to ensure that the castle's surroundings would remain intact. Both the castle and the surrounding land are managed by Historic Scotland.
References:Bomarsund fortress and garrison was built in 1832-1854 by Russian Empire to defence Åland Islands against enemies. British and French fleet attacked against it during the Crimean War in 1854. After a week of fighting the British stormed the remaining fort. Anglo-French forces destroyed it totally after battle. In the Treaty of Paris 1856, the entire Åland Islands were demilitarized, which is a status that has been preserved until this day.
Nowadays there are some ruins left and fortress area is open for visitors.