This thesis examines La Petite Ceinture in Paris, a rail line that is no longer in official use by its owner SNCF [Societe nationale des chemins de fer francais] and its potential as a venue for useable open space and recreation. This rail line circumnavigates Paris just inside the Boulevard Peripherique and the border of the city proper. Therein lays its potential to provide the city with a circular greenway and promenade. In certain areas there are opportunities to provide open spaces for dense residential neighborhoods where a plaza or a park is more than a 10 minute walk. Additionally it would connect other parks, plazas and bike routes that are currently unconnected thereby expanding safe bike routes that are uninterrupted by vehicular traffic. As the line is located in residential neighborhoods toward the outskirts of the city, it is therefore postulated that this space will be useful for the citizens of Paris and assist them in their daily lives.