The text discusses various lists and rankings of the world's least-visited countries, such as the Top 10 Least-Visited Countries by the United Nations World Tourism Organization and a list of 7 of the world's least-visited countries and how to visit them. It mentions specific countries, including Nauru, Tuvalu, Kiribati, and Marshall Islands, as well as larger regions such as Europe and the South Pacific. The text also highlights some unique features of these often-overlooked countries, like Madagascar's wildlife and Tonga's small size and little-known capital city. Ultimately, it encourages readers to consider visiting these lesser-traveled destinations for their unique experiences.