On one Greek expedition with compatriot art historian Daniel Baud-Bovy, Boissonnas made the first recorded modern-era ascent of Mount Olympus on 2 August 1913, aided by a hunter of wild goats from Litochoro, Christos Kakkalos.

He visited The Acropolis,[3] Delphi, Olympia, Dodoni, Knossos, Delos and many other sites, providing an extensive iconographic panorama of classical Greek antiquities.

[4][5] Daniel Baud-Bovy wrote of other ambitions of their collaboration on these publications; "For many years, Greece was considered as one of these dead stars, whose rays, reach us through the centuries past.

[6] Incidentally he took five hundred photographs of the automatic dances of a young woman known as 'Magdeleine G' at the Parthenon in antique costume, commissioned to illustrate the hypnotist Émile Magnin's book L’Art et l’Hypnose,[7][8] and later admired by the Surrealists.

His last photo-album about Greece published in 1933 was titled 'Following the ship of Ulysses' that sought to reconstruct the epic and, in a symbolic way, the dissemination of Greek culture throughout Europe.

[2] As Irini Boudouri has shown,[10] in addition to being an adept craftsman, Boissonnas was a canny businessman, who persuaded the Greek state authorities that his photographs would enhance the country's political, commercial and touristic image abroad.

The support of faithful allies anticipates the hour when Greece, which has given the world the purest jewels of civilisation, will contribute to the reconstruction of Europe on the very borders of the East.

[15] A second expedition that he prepared with extensive research on Sinai in the Geneva public library's books on archaeology, Biblical scholarship and literature, as well as early travel guides, was to be published as Au Sinaï, a quasi-scientific, cultural and very personal document; the culmination of a lifetime's study of the ancient civilizations of the Mediterranean.