Reykjadalur is one of the easiest accessible hot springs from Reykjavik. Situated in the town Hveragerdi you can hike up to the warm river that flows down the valley. Travelling in the northern region of Iceland, close to Akureyki, you will find a hot spring in a cave. Yes, a cave! Located close to Myvatn this is a must do experience when you are in the area. The temperatures of the hot springs varies throughout the year, so you should always seek information about the safety before jumping into the waters.