I found it a bit spooky to walk here on my own on a quiet Sunday morning. The complex is huge, with multistorey buildings, bridges, railway lines, and towers. All in the same dark red colour.

Since the mining here stopped, nature is beginning to win back its territory. Most of the railway tracks and the smaller industrial leftovers are now covered with moss, grass, and weeds. This adds a special atmosphere to the place - a good location for a film director to shoot a thriller.

Many of the buildings nowadays are used for art exhibitions. The Red Dot Design Museum is worth a visit both for its collection of contemporary design and to take a look inside one of the industrial halls.