From the groundbreaking sea voyage in 1735 that settled the debate raging between Descartes and Newton about the shape of the earth to the balloon ride that led to the discovery of cosmic rays, mankind has pushed the limits of what's possible, both on our planet and beyond the clouds. Here Jheni Osman presents some of the most daring and eye-opening adventures in history that have changed the way we view the world, as well as a look at what's still to be discovered.