UFOs are going mainstream. Here are 5 spots to visit if you're looking for aliens.

• A former military officer testified at a congressional hearing last week that the US has evidence of alien life. 
• The country's fascination with aliens and UFOs has translated into big money for some tourism sites.
• From Pennsylvania to California, here are some locations to visit to take a trip into the unknown.

Tales of extraterrestrial encounters and alien arrivals have long had a place in the folklore of American cities big and small, but over the last few years, Americans have found more reasons to believe there's life beyond Earth.