The Sonian Forest, a sprawling 4,421-hectare haven of biodiversity at the southeast edge of Brussels, Belgium, holds the distinguished honor of being part of the UNESCO World Heritage Site. This recognition is a testament to its exceptional beech forests, which are part of a larger group of 94 primeval beech forests across 18 European countries, showcasing the remarkable evolution and impact of the beech ecosystem since the last Ice Age. The forest's inclusion in this prestigious list underscores its importance as a natural heritage site, reflecting centuries of ecological history and the enduring legacy of Europe's ancient woodlands.