The Isotope mass separator on-line device (ISOLDE) studies the properties of atomic nuclei, with further applications in fundamental studies, astrophysics, material and life sciences. It is a unique source of low-energy beams of radioactive nuclides that is delivered to various experimental stations (around fifty each year). Presently more than 450 researchers are active at ISOLDE.
The CERN is the European Organization for Nuclear Research, it's also the largest particle physics laboratory in the world. The whole laboratory host more than 2500 staff members. Birthplace of the world wide web. I was lucky to be able to visit some of the experiments running there and take images along the way.