Grotte Bérelle, Gallo-Roman cistern in the 5th arrondissement of Lyon, France.
Grotte Bérelle is a large underground cistern beneath the esplanade of Lycée Saint-Just, featuring impressive vaulted ceilings and intricate design.
Listed as a historical monument since 1862, the cistern was originally used to store water brought by ancient Roman aqueducts to Lyon.
Over centuries, the cave attracted numerous visitors and historians, evident from graffiti dating back to before the Renaissance.
Though well-preserved, the cistern is currently inaccessible to the public due to safety concerns, highlighting its protected status.
An often overlooked marvel, it once captivated history enthusiasts seeking hidden archaeological treasures.
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