Step into a piece of local history at the Collegiate Church of Saint Gertrude, a true gem right in the heart of Nivelles. This isn't just any church; it's one of Europe's oldest and largest Romanesque churches, and you can feel the centuries of history as you wander through its vast, serene interior. Don't miss the chance to explore the archaeological crypt and, if you're feeling energetic, climb the tower for a fantastic view. It’s a peaceful and awe-inspiring place that offers a real sense of connection to the town's deep past.