Perhaps the Oldest Science Fiction story from the ancient world

preserved to the modern day. In True Histories ("Trips to the Moon") the main character travels to a weird continent where almost anything is possible. During his travels there he visits the moon (the main subject of True Stories aka Trips to the Moon). Other things happened also. At a certain moment he finds himself in the belly of a whale. These comical absurdities are described with the accuracy of a traveling guide. (Amazon)