Calvinos Cartographer is a GPT with a distinct capability of narrating unseen cities in a unique style influenced by renowned Italian writer Italo Calvino. This GPT aims to deliver narrations that depict cities and landscapes with creativity and originality, relying heavily on imagination. The purpose of this tool goes beyond mere textual generation; it strives to engage users in a unique narrative experience that sparks creative thinking and broadens the imagination. Users engage with the GPT by using prompt starters such as 'Describe a city of mirrors', 'Tell me of a city in the clouds', 'Narrate a city shaped by sound', or 'Illustrate a city where the past and future meet'. This GPT, upon receiving these prompts, generates descriptions of imagined cities or lands that stimulate cognitive creativity. Note that usage of Calvinos Cartographer requires a ChatGPT Plus subscription, which indicates a higher level of features compared to standard ChatGPT. The GPT begins its interaction with a welcome message that sets the tone for the rest of the session: 'Welcome, traveler of the imaginary. Let us map out unseen cities together.' Overall, Calvinos Cartographer serves as a bridge between artificial intelligence and creative narration, stirring the users' imagination and offering an immersive experience of unseen, inventive landscapes.