Awesome typographical architecture feature from late 2011 on the Letterology blog. My favorite is the Lentos Art Museum.
The Lentos Art Museum in Linz, Austria designed by Weber & Hofer in Zurich. It has a transparent glass casing covered in a pattern of words (lentoskunstmuseum) which has the enormously scaled "Lentos" reversed out of the this text. At night it is brilliantly lit with colored lights which makes a beautiful setting on the Danube River.