You can smell the minerals in the water as you unload the family at the Cave and Basin National Historic Site, the place where two railway surveyors spotted a cave and series of natural hot springs back in 1883. They were helping to build the railroad across Canada, but they inadvertently started the country’s extensive national park system. Before the railway was finished two years later, the cave and basin had been set aside as a natural preserve. Join the millions of visitors who marvel at the area's underground cave each year. Its bubbling thermal waters smell of sulfur and exude history.