And the Guardian has a list of them.  If you are going to Paris, take a quick peek and take notes. Yes, many you may have heard of, as I had. One I hadn’t is pictured above and is relatively new:

Opened in 1993, six years before New York’s similar High Line project, La Promenade Plantee is a tree-lined walkway on an old elevated railway line in east Paris. The 4.5km trail is a wonderful way to explore the city, taking you up and down staircases, across viaducts, above the streets and offering the occasional chance to wave back at the lucky Parisians whose apartments overlook it. The walkway also runs over the Viaduc des Arts, a bridge in which the arches are now occupied by galleries.

• 12th arrondissemen, promenade-plantee.org

For more from the list, see 10 best free things to do in Paris | Travel | theguardian.com.

Bonus: here’s a piece from the Globe and Mail how to eat like a Parisian. Since you’ll be enjoying all these free things in Paris, you’ll have more money for food.