I lived in Paris for seven years, first as a student (meaning broke) and then as a freelance journalist (meaning even more broke). I love trying new activities and getting deep into the culture of wherever I’m living, so I sought out all possible free things to do in Paris.    And the good news is that, even though the city itself is expensive, there are tons of activities that cost absolutely nothing. These include visiting world-class museums, going on hikes, and trying out sports from fencing to climbing. In fact, some of the most iconic experiences in Paris...