The Arganzuela Footbridge located in Madrid, Spain was indeed a beautiful addition to the landscape when it was opened to the public back in 2005. Designed by Dominique Perrault, the helix-footbridge spanning over 250 meters in length connects the Arganzuela and Carabanchel neighborhoods.
Designed for pedestrians and cyclists, the footbridge consists of two metallic cones. It allows the passage of people from one side of the park to the other while also providing one of a the main entrances to the park below. The park, which hides some of the buried highway’s technical infrastructures, has an irregular topography. Playing with that topography, the two cones join above the curve of a hill, and are offset to create a new entrance point to the park. The first cone – to the south – spans from the Avenida de Manzaranes, crosses over the river and then joins the top of the hill. Placed offset to the first cone, the second cone – to the north–passes over the other side of the park to reach the Paseo de Yeserias. This positioning creates a platform over the park and the surrounding city, and an exceptional vantage point from which to admire the famous Toledo Bridge....check out the below showing the design & construction of the footbridge (in Spanish)