There are two types of Belgian Waffles. One from Brussels which is light and used as a carrier for its toppings baked on large deeper cast iron plates You find these type in many restaurants around the United States.
The other is the Liege Waffle from Belgium. It is often served as street food across Europe and Asia. The Liege waffle is made from a modified Brioche DOUGH and not a batter. The Liege Waffle rises from yeast instead of baking powder. It is heartier and once you try one, it will be hard to go back to regular waffles. The Liege waffle uses Belgium pearl sugar (a beet sugar that is as large as a pea.) The sugar is throughout the waffle, but when it is baked on a cast iron waffle iron, the outside sugar carmelizes making the waffle crispy on the outside and soft on the inside. There are several places in the US that serve these waffles, most of them in large cities.
There is a food truck in central Illinois (Champaign & Urbana) that makes these waffles from scratch each day in their certified commercial mobile kitchen. It is called the Crave Truck and has quite a local following.