France, Switzerland, Cern, open door, visit to the km tunnel housing the LHC particle accelerator: large hadron collider the tube contains the superconducting electromagnets

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Photo credit: © LANSARD Gilles / Hemis.fr / Alamy / Afripics
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Keywords: ain, alpes, architecture, border, building, cultural, east, engineering, europe, france, horizontal, indoors, laboratory, museum, research, rhone, scientific, switzerland, tourism, tunnel, types, visit