Knot Springs is a wellness club on Portland's Central Eastside with soaking pools overlooking the Willamette River and the downtown skyline. Its circuit includes a warm pool just below body temperature, a 104-degree hot pool, a dry sauna, a steam room infused with essential oils and a 47-degree cold plunge, alongside a full gym with fitness and yoga classes and a massage studio. Two-hour Springs Visits cost $69 to $89 and are open to non-members; swimsuits required. Open daily 7 AM to 9 PM.