What I really enjoy about the European Union is being able to travel without passport from one country to another. I still remember what is was like when you had to show your ID and pass a border simply for traveling through a then-devided Germany. We must never go back.
What is more, thanks to the Euro, you don’t even need a different currency when you travel from Germany to France, for example. I just recently enjoyed the beautiful landscape, cool castles, and picturesque villages of Alsace.