Paris
Along its 2.8 miles (4,5 km) through the Paris 12th district, the Planted Walk offers strollers a real moment of freedom and greenness inside the city. It was inaugurated in 1988, and designed on top of an old railway line that was no longer used as of 1969. It begins near the Bastille Opera, follows the Viaduct of the Arts, some tunnels, some passing through vegetation and buildings, and leads you to the Porte Dorée and the Vincennes Park.
It has to be done, not talked about...!