The Carnegie Endowment for International Peace is based out of several countries. In 1993, the Endowment launched the Carnegie Moscow Center, with the belief that, "in today's world a think tank whose mission is to contribute to global security, stability, and prosperity requires a permanent presence and a multinational outlook at the core of its operations".
Carnegie's stated goal is to become the first multinational/global think tank.
The Carnegie Endowment now has operations in several countries, with headquarters in Moscow, Beijing, Beirut, Brussels, and Washington, D.C..
[Wikipedia]