The scientific opportunities provided by particle physics experiments bring hundreds of scientists from every corner of the globe to work together at experiments all over the world. Both the technical scale and the cost of today’s accelerators and experiments put them beyond the reach of any single nation’s ability to build or operate. Particle physics projects now take shape as international endeavors from their inception. These scientific collaborations take on new significance as beacons for free and open exchange among men and women of science from all nations. They offer an inspiring model for cooperation from a field known for its leadership in international collaboration.