Lombardy (Lombardia) is one of the richest regions of Italy, due to the fertile Po valley and the industrial/financial might of Milan.
See the Milan page for more...
...including Lake Como, Garda, Maggiore, etc also has its own page
Hilltop town with a bunch of cool museums and palaces, about 1 hour NE by car or train from Milan. The area around Bergamo is known for creamy Taleggio cheese. There's also a local specialty, "polenta e osèi" which means "polenta with little birds" but the more common dessert version is actually a sponge cake with marzipan and chocolate "birds".
Al Donizetti - Slow Food establishment, serves up salumeria, lardo, etc, rec'd by Time Out
Antica Trattoria la Colombina - rec'd by Time Out
Trattoria del Teatro - Slow Food, rec'd by Time Out
Lombardy's third-largest city, just north of Milan, home to the Formula One race and palaces. Duomo is cool, too.
Relatively large town not far from Milan
City surrounded by artificial lakes with a nice Medieval/Renaissance core that is an UNESCO World Heritage site. ~2 hours by car or train from Milan; Modena (in Emilia Romagna) and Verona (in Veneto) are actually closer, at ~1 hour by car or train. It's especially known for its pumpkin cuisine, especially tortelli di zucca.
Italy Magazine intro to Mantua's cuisine
The Guardian's article about Mantua being "Italy's sleeping beauty city"
Together these form an UNESCO World Heritage Site, these nine "holy mountains" are spread across Lombardy and Piedmont, each with a chapel