Is it slowing down time, deepening connections, and indulging in worldly pleasures? Is it adrenaline, discovery, and the privilege of being the first to see or do one thing? In 2021 the world is up to you. You will enjoy the privilege of choosing between two world cruises, each designed to bring you the best of the world in the way you dream of experiencing it. Silversea 2021 World Cruises. You only live twice.