Lonely Planet about Antwerp :

"Home to Belgium's largest Gothic church (Onze-Lieve-Vrouwe Katedraal), and the birthplace of Rubens, Antwerp is a haven for art lovers, architecture buffs and aimless wanderers.
For a great collection of Flemish Primitives, check out its Royal Museum of Fine Art. And for a great collection of exotic beasties, the Antwerp Zoo is highly recommended."