Krosslaug (the Pool of the Cross) is a small hot pool in Lundarreykjadalur in south-west Iceland. As the story goes, in the year 1000 C.E. when the people of the country voted to accept Christianity in Þingvellir, the contingent from the west of the country refused to be baptised in the icy waters at Þingvellir (we’re talking immersion baptism) and were instead baptised in this hot pool.
There is a plaque in Latin commemorating the event, and the pool is surrounded by a small and lovely planted forest. Unfortunately, as I have seen at almost any place of interest in Iceland that lacks sanitary facilities, the area near the pool is strewn with toilet paper and the ever-present lone tampon (there is always just the one – I have never seen more in any place, and so far I have been spared finding any fresh ones). I also found a lone sock, no doubt lost by someone who wanted to bathe their feet in the warm water.