Three travellers float in the middle of the Mediterranean. As they allow themselves to be carried by the currents to a destination that they don’t yet know, they try to remember the names of the 55 cities described by Italo Calvino in his book Invisible Cities. These are cities with names of women, as if the cities were also people. People who are attractive or strange, old or newborn, peaceful or frantic. People who have desires, memories, voices. In Calvino’s book, the cities are the protagonists of stories in which real and invented regions become confused with one another, linked by roads where the traffic flows freely. But for the travellers drifting across the sea, who are making an imaginary cartography of unlikely cities that they may perhaps never get to know, it is necessary to cross over frontiers – those lines that unite but also separate territories, people and cultures.