Actually, Altair and Vega had been to Paris quite often. Since they were little, both of them had been used to traveling the world with their parents. Not only because their father and mother had houses in many countries, but in the past, they were often taken by Nicolae for adventures when he was still in a relationship with Aleksis.
At that time, Alaric and Aleksis were separated for ten years, and each did not know that the other was still alive. Nicolae often brought Aleksis and her two children to entertain them, and he trained the twins to become independent.
They had explored the Caribbean, Africa, Mongolia, and even saw the aurora twice. Once in Iceland, and once in Norway. They were quite familiar with various important cities in the world.