Only 4 km from the city center, the Sonian Forest extends over 45 km² at the gates of Brussels. Jump into the saddle and set off to discover this true green lung, classified as a UNESCO World Heritage site since 2017. Follow the guide in search of the places and monuments that dot the forest. Find the former abbey of Groenendael, the valley of the drowned children, the Queen's Chapel, or even Notre Dame de Bonne Odeur, as many places oscillating between legends and history.