In July of 2019, more than 1 million people banded together online and hatched a plan to raid Area 51, the top-secret Nevada base where the United States government purportedly detains extraterrestrials. But there’s no need to force your way into the high-security site. From an airstrip in Argentina to an allegedly alien-packed airport in Colorado, here are 17 places you can actually visit to search for signs that we’re not alone in the universe.