Canmore, Alberta, is home to one of Canada’s largest undeveloped cave systems, the Rat’s Nest Cave, located beneath Grotto Mountain. Operated by Canmore Cave Tours, this thrilling underground adventure offers two types of tours: the Adventure Tour and the Explorer Tour. The Adventure Tour, suitable for those with a moderate fitness level and a sense of adventure, lasts about 6 hours, with 4 hours spent underground exploring challenging sections like the “Laundry Chute” and the Grand Gallery. It includes an 18-meter rappel and costs $199 for adults. The Explorer Tour, ideal for families and beginners, is a 4.5-hour tour with 2.5 hours underground, offering a less intense experience with views of ancient bones and unique formations. This tour costs $149 for adults. Both tours provide all necessary caving gear, including helmets, headlamps, coveralls, gloves, kneepads, harnesses, and backpacks. Participants are advised to bring a water bottle, an energy bar, and wear light hiking shoes and warm clothing. The cave is accessed via a 30–40 minute hike, and the tours are available year-round. Meeting points for the tours are at 129 Bow Meadows Crescent, and reservations are required in advance. This underground adventure is a must for those seeking to explore the Canadian Rockies in a truly unique.