Mitterrand branch, Bibliothèque Nationale de France, Paris

Mitterrand branch of the Bibliothèque Nationale de France, Paris, designed by Dominique Perrault.
The towers, which are meant to look like four open books, surround a courtyard with a small forest that was shipped in from Normandy.

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Tips for Paris-bound geeks: A company called HotCafé has been putting WiFi hotspots, most of them free, in a bunch of Paris cafés. The McDonald's hotspots are also free here, but the croissants are not going to be as good. For dial-up there are "free" ISPs -- you pay for a local call, and the ISP gets a cut of that. I have had good luck with FreeSurf.