Ferrara is an old city in Northern Italy half way between Bologna and Venice. It is completely surrounded by walls, and is considered to have the best preserved Renaissance fortifications in Italy. Outside these walls remains the moat, which has been dried and is a park. At the center of the city is a castle, which has a moat still in function. The castle is straight out of story books and is pretty cool to see.
Aside from castle and walls, the city also has really cool streets just worth strolling through. Different eras of the city can be quickly seen, from medieval to renaissance to modern. The Diamond Palace is known for its strange Diamond facade while the Duomo is mostly just a facade.
The city is best seen by bike and you will rarely see other tourists, although they do come. Best to try Ferrara’s famous pumpkin/squash pasta. It sounds weird, but it is incredibly tasty.