Fort Rapp is part of the 14 fortifications erected in Alsace by the Prussian general Von Moltke after the fall of Strasbourg in 1870 during the Franco-Prussian War and following the siege of Strasbourg. Built between 1872 and 1874 and inaugurated on 26 September 1874, it was part of the fortifications meant to protect the city from French attacks. Since 1918 and the return of Alsace-Lorraine to France, it is named after the French general Jean Rapp. The fort is located in Reichstett, a village situated 10 minutes north of Strasbourg and belonging to the Urban Community of Strasbourg. The fort contains 200 rooms and was able to host a garrison of 800 men. It was protected by 18 cannons of 90 – 150 mm.
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.