The Citadella is the fortification located upon the top of Gellért Hill in Budapest, Hungary. Citadella is the Hungarian word for citadel, a kind of fortress. The word is exclusively used by other languages to refer to the Gellért Hill citadel which occupies a place which held strategic important in Budapest's military history.
The fortress was built in 1851 by Julius Jacob von Haynau, a commander of the Habsburg Monarchy, and was designed by Emmanuel Zitta and Ferenc Kasselik, after the Hungarian Revolution of 1848. It occupies almost the entire 235 metres high plateau.
Next to the northern longitudinal wall of the Citadella, there is an open-air display of a small collection of Red Army weaponry, most of them from the Second World War.