An outdoor “living room”, enclosed on one side by the columns of the Temple of Hadrian. The temple was dedicated to the emperor after his death in 145 AD.
11 of the 13 columns remain on the north side. The building opened onto what is now Via del Corso. The surviving structures are incorporated in the building of the "Burrò" pontificate, which today is the Chamber of Commerce. At number 36 in the square, a model of the temple is a must to be seen.