California’s Silicon Valley is the world capital of technology. Almost all of today’s tech behemoths currently call it home: Facebook, Google, Apple, Hewlett-Packard. But 10, 30, 50 years down the road, will Silicon Valley still be the top hotbed of innovation? The map below shows 20-some places that, at one time or another, have entered the running to become a potential successor to Silicon Valley—or at least a regional counterpart.

Of course, this list isn’t comprehensive. Around the world, towns, regions, and even whole countries are investing in their technology industries, hoping to create their own Silicon Valleys. As Matt Yglesias recently wrote in Slate, it’s not always a worthy investment for local government. But one country that may have a better chance than others at fostering such an environment may be China, whose Shenzhen has boomed in recent years. On Friday, Oct. 12, Future Tense—a partnership of Slate, the New America Foundation, and Arizona State University—will host an event called “Arms Race vs. Relay Race: What Does Innovation Hold for China?” at the New America Foundation in Washington, D.C. To learn more and to RSVP, visit the New America Foundation website.