Beitou Thermal Valley Park (北投地熱谷公園)
During the Japanese colonial era Beitou was developed into a major hot spring resort area and marketed as "one of Taiwan's eight attractions and twelve scenic spots". There is even a special MRT metro branch line from Beitou Station to near Beitou Thermal Valley Park. Over time this whole part of Taipei expanded to include various spa-related businesses and infrastructure. I figured this would be a good place to go to relax a bit at the very end of the trip, while also seeing some sights.
What's somewhat unique about the geothermal properties here is that there are minute traces of radium in the geothermal pools. What's even more unique is that it is only one of two places on Earth where
hokutolite forms - the other one is the Tamagawa Onsen in Akita Prefecture, Japan. Hokutolite is a rare mineral containing radium, lead sulfate, and barium sulfate. From what I understand this is because the conditions required for hokutolite are extremely narrow and specific: near-boiling acidic water, high sulfate concentration, specific volcanic geology, and a slow cooling over time. And it so turns out that only two places on the planet meet all the conditions.
And you might say.. Radium? Isn't that dangerous? I did the math and it turns out it's a matter of amount and perspective. If you were to
drink a full liter of Beitou geothermal water you'd get about 0.01% of the radiation you typically get during an X-ray. So while I can't vouch for any of the medical claims written on the following tablet, I can say with full confidence that if your concern is the radiation from the radium just walking through the Beitou geothermal area is 100% safe. Spas in the area
do use Beitou hot spring water, but not the boiling ultra acidic water from the thermal valley.
To add to that, having just googled this, the prevailing scientific consensus appears to be that there are no known health benefits to radium. In the early 20th century, after radium was discovered by Marie Curie Skłodowska, it was marketed as a miracle substance by some for a while. There was a bit of hype but it seems there was nothing to it.
Imagine my disappointment when I arrived here and realized that the whole Beitou Thermal Valley Park and many of the related businesses all shut down every single monday. In Taiwan mondays are often designated for maintenance, cleaning, and safety checks, affecting parks, museums, and other establishments, but somehow I had not noticed until now.
While the park and many of the spas were closed, the public spaces in Beitou District were nevertheless worthy of a walkthrough. I was hoping to see the official park and Bitou Hot Spring Museum and a couple of other places, but what can you do, no choice but to enjoy the rest of the day.
I did in the end find a well reviewed open spa where I splurged a bit on a massage by a professional. I swear it was the only open spa in the area that I could find, but it ended up being a properly relaxing and at times intense experience. They pampered me quite a bit and it was awesome.