Gediminas' Tower is the only remaining part of the Upper Castle in Vilnius. The first fortifications were built of wood by Duke of the Grand Duchy of Lithuania, Gediminas. Later the first brick castle was completed in 1409 by Grand Duke Vytautas. Some remnants of the old castle have been restored, guided by archeological research.
It is possible to climb to the top of the hill on foot or by taking a funicular. The tower houses an exposition of archeologic findings from the hill and the surrounding areas. It is also an excellent vantage point, from where the panorama of Vilnius' Old Town can be admired.
Gediminas' Tower is an important state and historic symbol of the city of Vilnius and of Lithuania itself. It is depicted on the national currency, the litas, and is mentioned in numerous Lithuanian patriotic poems and folk songs. The Flag of Lithuania was re-hoisted atop the tower on October 7, 1988, during the independence movement that was finalized by the Act of the Re-Establishment of the State of Lithuania on March 11, 1990. A reconstruction of the Royal Palace of Lithuania was completed in 2009, and is located near the base of the hill upon which Gediminas' Tower stands.
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.