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Infectious enthusiasm at the Open Days

75 000 visitors discovered hundreds of activities on nine CERN sites over the weekend

OpenDays 2019 - Highlight pictures
A selection of photos taken by the CERN Pool of photographers during the Open Days on 14 and 15 September 2019. (Image: CERN)

Admire technological wonders 100 metres underground, drive cranes, play with miniature accelerators, operate robots, discover a multitude of technologies and immerse yourself in the enigmas of the Universe... you were some 75 000 visitors this weekend participating in CERN's Open Days.

open days
An exceptional opportunity to visit the Large Hadron Collider tunnel. (Image: Maximilien Brice and Julien Ordan)

Two days of discoveries and meetings led by nearly 3000 volunteers from CERN, its institutes and contracting companies. Enthusiastic volunteers, delighted to share their passion, knowledge and expertise.

open days
Two young visitors overwhelmed by the magnificent CMS detector, completely open for the occasion. (Image: Maximilien Brice and Julien Ordan/CERN)


Some 160 visit points were open, with hundreds of activities at nine sites on both sides of the border. An immense event to relive in images.


Images: Maximilien Brice, Anna Chrul, Samuel Hertzog, Julien Ordan, Fons Rademakers and Didier Steyaert