The Promenade Plantée in Paris is a 4.7 km or 2.9 mile elevated linear park built on top of obsolete railway infrastructure in the 12th arrondissement. It was inaugurated in 1993. 

The Planted Walk‘s official name is Coulée verte René-Dumont. It inspired similar projects such as The High Line in New York. White quite some imagination you can say the future Spoorpark linking Zurenborg with Borgerhout in Antwerp is somewhat similar. 

Thanh and I were there in 2012.

The Promenade Plantée is an extensive green belt that follows the old Vincennes railway line. Beginning just east of the Opéra Bastille with the elevated Viaduc des Arts, it follows a 4.7 km path eastward that ends at a spiral staircase leading to the Boulevard Périphérique beltway. 

At its west end near the Bastille, the parkway rises 10 m above the surrounding area and forms the Viaduc des Arts, over a line of shops featuring high quality and expensive arts and crafts. The shops are located in the arches of the former elevated railway viaduct, with the parkway being supported atop the viaduct. This portion of the parkway runs parallel to the Avenue Daumesnil. 

The parkway intersects the Jardin de Reuilly near the rue Montgallet and descends to street level. At that point, it becomes a grassy mall and then follows the old railway direction below street level towards the east, passing through several tunnels. As it reaches the Rue du Sahel, it splits, with one portion continuing to the beltway, and the other terminating in the Square Charles-Péguy along the former path of a branch line that once linked to the Petite Ceinture railway.

• 

• 

• 

• 

The elevated part of the route, on the viaduct, has some enclosed sections, as when it passes between modern buildings, and some open sections with expansive views. 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

In addition to the Jardin de Reuilly and the square Charles-Péguy, the Promenade Plantée also includes the Jardin de la gare de Reuilly, with its preserved but unused railway station, and the Square Hector-Malot.

With input from Wikipedia.