For many centuries, people lived in caves and only came out to hunt or curse their neighbours for hitting golf balls through their windholes. Suavely spelunk ancient dwellings with today's Groupon: for $16, you get two cave-tour admissions to Bonnechere Caves in Eganville (up to a $32 value). Admission for children younger than 4 is normally free .

Encased in exquisite limestone and shrouded by rock icicles, the ancient fossils nestled in Bonnechere Caves captivate visitors with their beauty and rare accessibility granted through guided tours. Expeditions depart every 20 minutes during summer months and, for 45–60 minutes, lovingly traipse through stony passages enriched with remnants of 500-million-year-old sea creatures and Scarface posters still hanging from prehistoric dorm rooms. Bring along a flashlight for enhanced examination or a picnic lunch to enjoy at the provided tables. Suitable for all ages, excursions welcome cameras for capturing the historic walls, cascading waterfalls, and affable bats. Bonnechere Caves' sagacious staff encourages sweaters for protecting against the chilly drafts and blending in in case a pack of woolly mammoths returns home early.