Baden-Württemberg is a state in Germany. Its world famous Black Forest and the celebrated, romantic city of Heidelberg are top tourist destination within Germany and Central Europe, but there is much more to see.
Hesse is one of the states of the Federal Republic of Germany. You can talk English in Hesse without a problem, but it's better when you speak slowly, as many people are not confident about their English and do not want to embarrass themselves with a native speaker.
Brandenburg, is both a historical region and a modern federal-state in Germany. Brandenburg was historically composed of a larger amount of territory now located across the Oder River in western Poland.