Where is the world's largest collection of antimatter experiments based?

CERN in Geneva, Switzerland, is one of the world’s main centers for antimatter research. Several specialized experiments there, including ALPHA and AEgIS, focus on trapping antimatter atoms such as antihydrogen and comparing them with ordinary matter. These studies test fundamental symmetries in physics, especially whether matter and antimatter behave exactly the same under gravity and other forces. CERN’s antimatter facilities have made it possible to store and study antimatter much longer than was previously possible.