One of the world's fashion capitals, Milan is often overlooked by tourists who flock to Rome, Florence, and Venice. But this gem of a city has a lot to offer, including the iconic Duomo di Milano, the world's largest—and perhaps most stunning—Gothic cathedral; the exquisite mosaics and glass vaults of Galleria Vittorio Emanuelle II; and impressive museums, such as the Pinacoteca di Brera. There's also trendy restaurants, gorgeous cafes, and the longstanding Milanese tradition of aperitivo. No trip would be complete without some serious shopping, and there are multitude of options. In the evening, grab tickets to a performance at the opulent La Scala opera house.