This palazzo is directly behind the Trevi Fountain, current entrance at Via della Stamperia 6. This palazzo is notable even if it was not the backdrop to one of the greatest fountains in the world. The name comes from a former inhabitant, the Duke of Poli. It was once the home of a famous Roman poet, G.G. Belli, as well as Russian princess Zenaida Volkonskaya, known for her salon, which attracted many writers and artists. Today the palazzo houses the Istituto Centrale per la Grafica (Central Institute for Graphics), which includes a free museum with changing exhibits.

It is a shame that the palace is almost exclusively associated with the Trevi fountain, which was placed against its smaller side and became an integral part of the entire complex. Regardless of the fountain, the palace, built in the century. XVI but subsequently restored and enlarged several times, it is of excellent workmanship. Furthermore, over the centuries, its rooms have been frequented by illustrious people such as Belli, D'Annunzio, Puccini, Gogol, just to name a few. Today it is state-owned and is home to the Central Institute for Graphics.