Have you ever wondered how we found Earth's position in the Milky Way? We know today that our Earth is located in one of the outer spiral arms of a galaxy. But this knowledge is not as old as you might think. The journey to this point, where we have finally found out where we are in the galaxy and in the universe, is like an adventure. To find out where we are and what the universe really is, astronomers have built ever more sophisticated instruments. To unravel the secrets of the heavens, some researchers even went to prison and endured severe torture.