The first time we landed in Paris, Chris and I knew that we’d be back. After all, who can land in Charles de Gaule without wanting to explore this gorgeous city? We were on our way to Croatia and didn’t have the time to head downtown, but we promised each other we’d come back. Then a few months later, I asked my sister if she wanted to visit us in Europe and told her she could either join us in Sofia for a week, or we could meet her in Paris and spend a week there. She had already made …