It was originally an important research centre for high-elevation medicine, but has since expanded to also become a mountain cabin for mountain climbers. Margherita Hut is one of the many huts in the Monte Rossa massif, but at 4,554 metres (14,941 ft) above sea level, it’s not only the highest one of them, but also the highest building in Europe. It’s open in the summer, from early June to early September, and offers sleeping accommodations for up to 70 people. Europe’s highest building is not accessible by helicopter; the only way to reach it is on foot, and that usually takes two days and requires physical fitness and a good knowledge of alpine techniques. For more impressive mountain-top attractions, check out Europe’s highest train station.