The Palazzo Poli is a palace in Rome, Italy, forming the backdrop to the Trevi Fountain, which is the most famous fountain in the world. Luigi Vanvitelli gave it a monumental facade as a setting for the fountain. It was there that Princess Zena?de Wolkonsky threw her lavish parties in the 1830s. The central portion of the palace was demolished to provide room for the large fountain in 1730. The Palazzo Poli is home to one of the world most important collections of copper engraving plates from the 16th century until present. The Palazzo also houses the Istituto Nazionale per la Grafica.