In the centre of Cologne (Germany), Peter Zumthor has transformed the ruins of Kolomba for the new building of the Cologne Diocese Museum. Zumthor has integrated the parts of the ruins into a new structure, building on the foundations of the old building. By not reconstructing it, but really making a new structure, with a new kind of texture. It is really challenging ruins like this - respecting them, but not deifying them - but it's amazingly done in this case. The new place has a superb atmosphere, but at the same time reminds of the memory of the place. Zumthor just has a way of building really tactile, sensitive buildings, and this is another gem in his oeuvre.
I stumbled upon this project on world architecture news.com.