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The Large Hadron Collider (LHC) is the world's largest and most powerful particle accelerator, located at CERN (the European Organization for Nuclear Research) near Geneva, Switzerland. It spans a circumference of about 27 kilometers (approximately 17 miles) and is situated underground. The LHC is designed to collide protons and heavy ions at very high energies, enabling physicists to explore fundamental questions about the nature of matter, the forces of the universe, and the basic building blocks of existence.