Villa Hadriana, near Tivoli, Italy. Central western parts, the Three Exedras Hall.

The Hadrian's Villa (Villa Adriana in Italian) is a large Roman archaeological complex at Tivoli, Italy. It is a property of the Republic of Italy, and directed and run by the Polo Museale del Lazio since December 2014.
The villa was constructed at Tibur (modern-day Tivoli) as a retreat from Rome for Roman Emperor Hadrian during the second and third decades of the 2nd century AD. Hadrian was said to dislike the palace on the Palatine Hill in Rome, leading to the construction of the retreat. During the later years of his reign, he actually governed the empire from the villa. A large court therefore lived there permanently. The postal service kept it in contact with Rome 29 km (18 mi) away.

Off the Three Exedras Hall were three garden exedras. The eastern and western exedras had sculpture in the center of the plantings.

more on https://en.wikipedia.org/wiki/Hadrian's_Villa , http://vwhl.clas.virginia.edu/villa/ and http://vwhl.clas.virginia.edu/villa/threeexedras.php