This small town is nicknamed "the hot spring capital of the world". Its geothermal park will amaze you.
Wikipedia http://en.wikipedia.org/wiki/Hverager%25C3%25B0i
Official website http://www.hveragerdi.is/English/
Address 10 Arnarheiði, Hveragerði 810, Iceland
Coordinates 64°0'0.004" N -21°11'59.975" E