"The Masterplan of the complex consists of a band around the former historic site, containing the necessary new programs and functions.
The prominent buildings and plants are enclosed within a single footpath which runs all the way round the complex. Here visitors can go walking, jogging or inline skating. Numerous connecting paths will be built between this 3,500 meter long ringway and the surrounding streets, connecting the site to the north of Essen.
The former rail tracks will be maintained as public space, and will connect the main buildings. The sky bridges, which transported coal from one part of the site to another, will be used for visitors who can also visit a 1,000 meter deep former mine tunnel." --See: http://www.arcspace.com/architects/koolhaas/zollverein/zollverein.html