Photograph of a soldier wearing a uniform and helmet. A handwritten note on the back of the photo says "John Wassel?"

Photograph of a group of men walking on a street in France, with buildings around them.

Portrait of William Hahn as a young man, wearing a military uniform and hat. A typed note in the corner of the photo says "Paris 1945."

Photograph of a monument in the middle of Place Vendome in Paris, France. A handwritten note on the back of the photo says "Paris, France June, 1945, Vendome Place."

Portrait of William Hahn wearing a military uniform. A watermark in the bottom corner of the photo says "Paris 1945." A handwritten note on the back of the photo says "Return William R. Hahn, June 1, 1945."

Photograph of mountains across Achen Lake in Austria, with a small city at the base of the mountains. A handwritten note on the back of the photo says "Alpine Tour 45, Achensee."

Photograph of cars and people on Avenue des Champs-Élysées, a street lined with trees in Paris, France. A handwritten note on the back of the photo says "Paris 45, Looking away from arc down Champs de Elysés."

Photograph of Basilique Notre-Dame de la Garde in Marseille, France, on the top of a hill. People are walking toward the building on a long sidewalk and stairs leading up to it. A handwritten note on the back of the photo says "Notre Dame Delagarde."

Photograph of Bourse Square in Marseille, France, with a large statue in the middle of the square and buildings on all sides. A handwritten note on the back of the photo says "Bourse Square."

Photograph of a cable car suspended above trees. A handwritten note on the back of the photo says "Alpine tour, cable car in Tyrolean Alps, Innsbruck 45."

Photograph of William Hahn standing on the sidewalk near Notre Dame in Paris, France. A handwritten note on the back of the photo says "Paris 45, side of Notre Dame, me on sidewalk between bicycles."

Photograph of the interior of a church, with pews facing an elaborately decorated altar. A handwritten note on the back of the photo says "Alpine Tour 45 Oberammergau inside church."

Photograph of Gare de Marseille Saint Charles in Marseille, France, with a grand staircase leading up to the building. A handwritten note on the back of the photo says "Train Station."

Photograph of a dirt road next to a wooden fence with mountains in the distance. A handwritten note on the back of the photo says "Taken at Holzkirchen. For the Alps in distance not too good. Needed a yellow filter."

Photograph of a group of soldiers standing at a railing inside of Hôtel National des Invalides, the building housing Napoleon's tomb in Paris, France. An altar is visible behind them, with an elaborate structure framing an ornate cross. A handwritten note on the back of the photo says "Inside of Napoleon's tomb. Tomb is where everyone is looking down. Paris 45."

Photograph of Innsbruck, Austria as seen from a mountain overlooking the city. A handwritten note on the back of the photo says "Alpine Tour 45, view of Innsbruck and Inn River, also cable towers for car."

Photograph of the city of Luzern and the surrounding countryside and lake, taken from Mount Pilatus. Typed text on the back of the photo says "Pilatus 2132 m; Blick auf Luzern und Zugersee. Pilatus 6396 feet, View towards Luzern and Zugersee."

Photograph of a long boat at a dock crowded with people, with the buildings of Marseille in the background. One of the buildings has a large sign on the roof that says "Le Petit Marseillais," and Basilique Notre-Dame de la Garde on a hill in the distance.

Photograph of the Marsaille waterfront, with Basilique Notre-Dame de la Garde on a hill in the distance.

Photograph of the buildings of Marseille, with people and cars on docks in the foreground. A handwritten note on the back of the photograph says "Waterfront."

Photograph of the peak of Mount Pilatus, with a stairway leading up the side of the mountain and more snow-capped mountains in the background. Typed text on the back of the photo says "Pilatus - Tomlishorn."

Photograph of snow-capped Mount Pilatus in Switzerland, taken from across Lake Lucerne. A typed note on the back of the photo says "Pilatus 2132 m; Pilatus 6396 feet."

Photograph of Mount Pilatus, with Hotel Pilatus barely visible on its peak and Lake Luzern in the background. Typed text on the back of the photo says "Pilatus mit Vierwaldstättersee. Pilatus with lake of Luzern."

Photograph of snow-capped Mount Titlis and Mount Sustenhorn in Switzerland, taken from Mount Pilatus. Typed text on the back of the photo says "Ausblick vom Pilatus: Titlis 3239 m und Sustenhorn 2931 m. View from Pilatus: Titlis 9717 feet and Sustenhorn 8793 feet."