The former coal washery represents the biggest construction volume of Zollverein. Back in the 1930s, this old coal mine in Essen was considered the most modern pit of its time; today, it has achieved the status of a world heritage site. The industrial site was redeveloped along the designs of Rem Koolhaas and will in future house the new Ruhr Museum. The opening, however, will be celebrated with the "Entry 2006" - an exhibition of prospects and visions in design (26 August - 3 December 2006).