Agilkia Island in the reservoir of the Old Aswan Dam along the Nile River is the present site of the relocated ancient Egyptian temple complex of Philae. Partially to completely flooded by the old dam's construction in 1902, the Philae complex was dismantled and relocated to Agilkia island, as part of a wider UNESCO project related to the 1960s construction of the Aswan High Dam and the eventual flooding of many sites posed by its large reservoir upstream. To allow Agilkia island to accominate the relocated temple, the island was leveled to match the old contours of Philae island as best as possible, which required the removal of the top of the island.
The most ancient was a temple for Isis, built in the reign of Nectanebo I during 380–362 BC, which was approached from the river through a double colonnade. Nekhtnebef was his ancient Egyptian royal titulary and he became the founding pharaoh of the Thirtieth and last native dynasty when he deposed and killed Nepherites II.
For the most part, the other ruins date from the Ptolemaic Kingdom, more especially with the reigns of Ptolemy II Philadelphus, Ptolemy V Epiphanes, and Ptolemy VI Philometor (282–145 BC), with many traces of Roman work in Philae dedicated to Ammon-Osiris.
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.