At this extraordinary site, visitors will find an underground museum including an art collection, one of the largest collections of paintings of portraits of children, a contemporary art exhibition – including works by, amongst others, Rebecca Horn, Domenico Gnoli and Meret Oppenheim – an enormous sculpture park and a rose garden with more than a hundred English rose varieties. This veritable wonderland of artists and foundation creators Ben Jakober and Yannick Vu can be visited by appointment.