Visitor to a Museum (1989)

Civilization as we know it has been destroyed, but remnants remain. In this story, a man has set his heart on visiting a famous pre-apocalypse museum which is now isolated in the midst of a new sea, the result of the melting of the polar icecaps. Those who hold onto the remnants of the old civilization live in isolated settlements, and keep a tight rein on the more numerous mutants, whom they keep in concentration camps. The stranger, who is an odd looking man, is taken by these mutants as a long-awaited messiah, and he swiftly becomes involved in the mutant-liberation rebellion, leading his followers to a new land on the other side of the sea.