Citadella is an citadel located upon the top of the strategic Gellért Hill in Budapest. The fortress was built in 1851 by Julius Jacob von Haynau, a commander of the Habsburg Monarchy, and designed by Emmanuel Zitta and Ferenc Kasselik, after the Hungarian Revolution of 1848. It occupies almost the entire 235 metres high plateau. The fortress is a U-shaped structure built about a central courtyard, being 220 metres long, 60 metres wide, and 4 metres tall. It had a complement of sixty cannons.
Actually built by Hungarian forced labourers, it was finished in 1854. In June 1854 Austrian troops settled in the citadel. After the Austro-Hungarian Compromise of 1867 and the establishment of Austria–Hungary, the Hungarians demanded the destruction of the Citadel, but the garrison troops left only in 1897, when the main gate was symbolically damaged. It was not until late 1899 when the city took possession of the Citadel. A few months later, in 1900, the walls were demolished.
In the Hungarian Revolution of 1956, Soviet troops occupied the Citadella. Tanks fired down into the city during the assault that overthrew the Nagy-led Hungarian government.
From the top of the Citadel, there is a panoramic view over the city, the Danube and its eight bridges. On the plateau and nearby are other points of interest like the Liberty Statue, Hotel Gellért, the Gellért Baths and the Gellért Hill Cave.
References:The ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.