When you arrive in Corfu, you may notice it doesn't look a great deal like the other Greek Islands -- in fact, it has a distinctly Venetian feel. That's because, unlike the rest of Greece, Corfu has never fallen under Ottoman oppression.
The Old Town is a perfectly preserved Venetian town, and a UNESCO World Heritage Site. Renaissance, Baroque and Classical touches can be found between every alleyway and square.
Some points of interest: the Old Fortress, Spianada (the largest square in the Balkans), and Liston (a promenade where the wealthy aristocrats used to hang out).