LLR6033175:
Train carrying workers into the northern entrance to the Simplon Tunnel, Switzerland (chromolitho), European School, (20th century) / Bridgeman Images
LLR6033184:
Southern entrance to the Simplon Tunnel, Italy, and a boring machine in action in the tunnel (chromolitho), European School, (20th century) / Bridgeman Images
LLR6033201:
Balloon of Swiss aeronaut Auguste Piccard, in which he ascended to a record altitude of 15,781 metres in 1931 (chromolitho), European School, (20th century) / Bridgeman Images