Nestled along the meandering Sotla river that divides Slovenia from neighbouring Croatia in the far east of the country, Terme Olimia may not be the easiest spa to get to from Ljubljana, but it is undoubtedly one of Slovenia's most popular - in fact, it was the top finisher in our Best Spas Poll for 2012. One look at both the facilities and the picturesque surroundings and it's not difficult to see why - different accommodation options radiate out from the pools, spas, wellness centres and water parks that have been built up around the natural thermal spring over the preceding decades. The newest part of the complex, the Orhidelia Wellness centre, was one of the finalists in the World Architecture Festival in 2009, and that same year the nearby village of Olimje was names as the most beautiful village in all of Europe. See their multi-lingual website for more information on accommodation, package offers and admission prices, or to make an online booking.