Basil and Elise Goulandris often traveled with the gems of their art collection, shuttling them between their apartment in Paris and their chalet in Gstaad, Switzerland, shown here. Hanging on the paneled back wall, from left, are Monet&#8217;s 1894 view of Rouen Cathedral, Pierre Bonnard&#8217;s 1907 &#39;In the Bathroom&#39; and Joan Miro&#8217;s &#39;The Grasshopper.&#39;