One of his novels consists of dialogues between Marco Polo and Kublai Khan about the title locations.  
In one short novella by this author, the title character walks in the rain to Cottolengo to monitor an election, while another work by this man consists of 27 meditations by the namesake character. In addition to The Watcher and Mr. Palomar, this man wrote novels about Agilulf and the Baron of Ombrosa, which together with another novel form his trilogy Our Ancestors. That work concerns Medardo of Terralba, who is blown apart by a cannonball.  One of his novels consists of dialogues between Marco Polo and Kublai Khan about the title locations.  Invisible Cities and The Cloven Viscount are novels by, FTP, this Italian author of If on a Winter's Night a Traveler.
In one short novella by this author, the title character walks in the rain to Cottolengo to monitor an election, while another work by this man consists of 27 meditations by the namesake character.
Italo Calvino