Last September, hundreds of amateur and professional photographers streamed into particle physics laboratories around the world to produce thousands of photographs of state-of-the-art equipment, laboratories and people, in all their beauty and complexity. Now, the vote is open for the public to choose their three favourite images.

In total, last year's Particle Physics Photowalk brought nearly 400 photographers to 10 leading physics laboratories. After a short pause for downloading, processing and, in some cases, actual developing, the photographers submitted their best photos to a series of local competitions. From these competitions emerged the top 10 photos from each participating country.

View the 40 finalists and cast your vote at http://www.interactions.org/photowalk/vote

In addition to the people's choice winner, a panel of international judges including Roy Robertson, President of The Royal Photographic Society, will select a second global winner. Both winning photos will be announced in March and will be displayed in laboratory exhibits around the world. They will also appear in the particle physics publications symmetry and the CERN Courier.

The participating laboratories are:

Brookhaven National Laboratory in New York, USA

Chilbolton Observatory in Hampshire, UK

Daresbury Laboratory in Cheshire, UK

Fermilab in Illinois, USA

Frascati National Laboratory in Frascati, Italy

Gran Sasso National Laboratory in Gran Sasso, Italy

Rutherford Appleton Laboratory in Oxfordshire, UK

Southern National Laboratory in Catania, Italy

TRIUMF in Vancouver, Canada

United Kingdom Astronomy Technology Centre in Edinburgh, UK