Grotte le Trou du Diable (Parc naturel régional de Portneuf)
This 8,000-year-old cave, located east of Saint-Casimir, is the second longest known cave in Quebec! Two types of visits: beginner (1 h 30) and adventure (3 h). Warm clothing and spare parts needed. Guide, helmet and lamp supplied. Six years and more. Mandatory reservation.