Throughout the centuries, people living around Lake Urriðavatn noticed certain spots on the lake that did not freeze in the wintertime. The Icelandic name given to these ice-free patches is Vök and their source was discovered to be underwater hot springs streaming up to warm the surface from deep under the lake. The Vök Baths resort in east Iceland allows guests to experience this phenomenon in a unique way, with a floating geothermal 'pool' nestled inside of a gorgeous lake. The best time to visit is in winter when the surrounding lake freezes. A hole is cut into the ice for brave bathing guests to leave the warm comfort of the spa and go for an ice cold plunge.