The Puerta de Alcalá is a Neo-classical monument in the Plaza de la Independencia in Madrid. It is regarded as the first modern post-Roman triumphal archbuilt in Europe, older than the similar monuments Arc de Triomphe in Paris and Brandenburg Gate in Berlin.
Puerta de Alcalá was a gate of the former city walls built by Philip IV. It stands near the city center and several meters away from the main entrance to the Parque del Buen Retiro. The square is bisected by Alcalá Street, although the street does not cross through the monument, and it is the origin of the Alfonso XII, Serrano and Olózaga streets. Its name originates from the old path from Madrid to the nearby town of Alcalá de Henares.
Madrid in the late 18th century still looked like a somewhat drab borough, surrounded by medieval walls. Around the year 1774, king Charles III commissioned Francesco Sabatini to construct a monumental gate in the city wall through which an expanded road to the city of Alcalá was to pass, replacing an older, smaller, gate that stood nearby. It was inaugurated in 1778.
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.