The Panathenaic Stadium or Kallimarmaro is a multi-purpose stadium in Athens. One of the main historic attractions of Athens, it is the only stadium in the world built entirely of marble.
A stadium was built on the site of a simple racecourse by the Athenian statesman Lykourgos c. 330 BC, primarily for the Panathenaic Games. It was rebuilt in marble by Herodes Atticus, an Athenian Roman senator, by 144 AD and had a capacity of 50,000 seats. After the rise of Christianity in the 4th century it was largely abandoned.
The stadium was excavated in 1869 and hosted the Zappas Olympics in 1870 and 1875. After being refurbished, it hosted the opening and closing ceremonies of the first modern Olympics in 1896 and was the venue for 4 of the 9 contested sports. It was used for various purposes in the 20th century and was once again used as an Olympic venue in 2004. It is the finishing point for the annual Athens Classic Marathon. It is also the last venue in Greece from where the Olympic flame handover ceremony to the host nation takes place.
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.