Canada/BC: Radium Hot Springs

Radium Hot Springs (the actual hot springs and not the town) lies within Kootenay National Park. The mineral-rich water bursts out of the ground at a temperature of around 44°C (111°F) and is the cooled to comfortable levels before entering the pools. As you relax in the hot springs pool, you are surrounded by the dramatic Sinclair Canyon. The name comes from trace amount of radon in the water, which is the decay product of the radioactive radium. The radiation dosage from bathing in the pools is considered inconsequential – half an hour in the pool will give you roughly 10x the normal background radiation level. It would be critical after about 1-2 years of nonstop bathing.