My fellow blogger Lucy wrote this great post on her blog about a well-known pathway among Parisians but little known among tourists. It is similar New York’s High Line though predates it, and as I live nearby in the 12th arrondissement, I can tell you it’s great for walks, strolls and runs. There are also many shops and boutiques under the archways of the old viaduct. Where to find it? You can find more here, even more in the French version, a walking guide in French and a jogging map.
It is near Gare de Lyon and runs from Château de Vincennces to near the Bastille in east Paris. Some metro stations nearby for access: Montgallet, Daumesnil, Gare de Lyon (though Montgallet is probably the best).
Below one picture of the Jardin de Reuilly and one from the Promenade. There is a great YouTube video tour of the whole Promenade here (also embedded below).