Sint-Janskathedraal
The most elaborate Gothic church in the country, its buttresses ridden by carved stone figures - including, added in 2011, an angel holding a mobile phone and a laptop bag. Inside are the 1622 Grand Organ and the medieval Zoete Lieve Vrouw statue.
Entry to the nave is free. The tower climb is separate, ticketed, and sells out on summer weekends.
Official site