In the countryside where Germany meets France and Switzerland, modernism superfans can live out their most indulgent aesthetic fantasies. They can put their feet up in a sprawling model home furnished with Panton chairs, Noguchi tables and other designer furniture. They can have an Eames lounger custom-built in front of them. And they can marvel at buildings designed by Frank Gehry, Zaha Hadid, Jean Prouvé and other internationally renowned architects.