Re-use on a big scale: Germany

It doesn't sound very sexy, going to old Nato bases somewhere in Germany or steel works in Ruhr, but it's a lot better than it sounds.

Alter Flugplatz Bonames, Frankfurt

What do you do when an old airfield is abandoned? You turn it in to a park of course. Let nature take over and have something which attracts people, like keeping the old tarmac by the flight tower for people to roller-blade on and convert the buildings in to a restaurant. On a German tour this has to be one of the stops. Tower Café, located in the park in the old airfield buildings.

Duisburg Nord Landschaftspark, Ruhr

I think I could get lost here, as simple as that. The park has some interesting lightning too so a visit twice is probably in order, and I suspect that this time of the year is the best time to go. Landschaftspark Duisburg Nord on the web.

Once these are ticked off I'd slowly cruise the narrow roads down the Rhine Valley and work my way through the villages and wineries, eating and drinking for a week at least.