Photos
Near Tübingen, Germany
Visiting Pisa and Florence, Italy (more photos: 1, 2, 3, 4, 5)
Mediterranean Coast near Marseille, France (more photos: 1, 2, 3)
Zürich, Switzerland
(more photos: 1, 2, 3, 4)
Mount Rigi, Switzerland
(more photos: 1, 2, 3)
Rio de Janeiro, Brazil (more photos: 1, 2)
St Louis Botanical Gardens
Trieste, Italy (more photos: 1, 2)
Euler Lecture, Potsdam