Arêtes de poisson, Underground gallery network in 1st district, Lyon, France
The Fish Bones tunnels consist of two main passages with 32 perpendicular galleries, extending over two kilometers beneath the Croix-Rousse hill.
The underground network remained unknown until 1959 when a sidewalk collapse led to its discovery, prompting authorities to seal off access with concrete barriers.
Local residents submitted numerous project proposals for the tunnels' preservation, with the virtual tour initiative receiving the most votes among 1500 submissions.
The galleries reach depths between 10 and 30 meters, featuring acrobatic passages and ladders, making them inaccessible to the public for safety reasons.
The tunnel system connects to two northern branches, each containing ten vaulted chambers and measuring approximately 300 meters in length.
Location: 1st arrondissement of Lyon
Website: https://aretesdepoisson.lyon.fr
GPS coordinates: 45.77310,4.83647
Latest update: June 23, 2025 09:39
European crypts and catacombs form a network of underground burial chambers beneath urban streets. These spaces house tombs, skeletal remains, and religious monuments from different historical periods. The chambers contain frescoes, mosaics, stone carvings and architectural elements that combine Roman, Egyptian and Christian designs. The structures reveal burial customs and religious practices from the 1st through 19th centuries.
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