Cold water, city views
Outdoor saunas have taken hold across Northern Ireland in the last few years, and most of them chase the coast. The Sweat Box went inland instead and put the heat in a country park on the edge of Derry, which means you get the fire, the cold water and the open sky without a two-hour drive to reach a beach.
The pitch does not need much dressing up. Get hot, get cold, sit for a minute, go again. Then go home feeling better than you arrived.