The Grotte de Spy (Cave of Spy) is located near Spy in the municipality of Jemeppe-sur-Sambre, province of Namur, Belgium. It has been classified as Wallonia's Major Heritage by the Walloon Region. It is one of the most important paleolithic sites in Europe, and has undergone many excavations with many recoveries. In 1886 a discovery was made that still represents a capital episode in the history of science.
The excavation was conducted by inhabitants of Liège, and consisted of an archaeologist (Marcel de Puydt), a geologist (Max Lohest) and a paleontologist (Julien Fraipont). This team proved to the international community the existence of a more antiquated type of human, the Neanderthal. Julien Fraipont published about Spy in an American review.