In this edition: lonely hearts, a luxury hotel in Bavaria, a Polish salt mine, a Berlin dream home and an underground lake in Switzerland.Are we really commitment shy?Michael Nast appears to have struck a chord with his bestseller on young Germans’ reluctance to commit to relationships. For months his readings have been drawing crowds of rapt - and at times cheering listeners.Wieliczka salt mineThe Wieliczka Salt Mine in Poland was named a UNESCO world heritage site in 1978. It opened up to visitors in 1993.Schloss Elmau turns 100A majestic hotel set in a glorious Alpine landscape - and also host to concerts with outstanding musicians, and seminars with leading intellectuals and politicians. It was also the venue for last year’s G7 summit.Underground LakeThe natural underground lake near the village of Saint-Léonard in the Swiss Alps is the biggest in Europe. Some 80,000 visitors are drawn to the lake's beauty and mystical atmosphere each year.Townhouse in BerlinArchitect Marcus Matthias has built his dream urban home in Berlin - a townhouse that is both relatively close to the center of town, and also right by the water.