DesciptiveVersion en ligne Guessing the picture through these following clues par Katerina Putri 1 It is located at the center of Rome, Italy Hints 1 The building is made of concrete and sand 2 The greatest work of the Roman architect 3 An elliptical construction of wall surrounding an elliptical arena where various of shows were held as an entertainment for the citizen of Rome 4 Nowadays it is the most visited tourism object in Rome.