‘Unseen landscapes’ examines some of the landscapes that are only just being revealed to us: submarine landscapes, and the landscapes of Mars and Titan. The major outlines of the ocean floor landscape have been mapped with remote-sensing techniques. Sea-floor geomorphology is building a new picture — we now know that there are more than 200,000 submarine volcanoes, many more than originally thought. Explorations of other planets have told us important things about Earth, for example we haven't found plate tectonics on other planets. We now know that Mars has polar ice caps, permafrost and volcanoes. All of these things are found on Earth, so what is their relationship?