Travelers may not be aware that the original cause of a wildfire can dictate if travel insurance coverage is available. (AP Photo/Noah Berger)

This summer, major wildfires have burned out of control in California and across the western United States, as well as in Germany, Greece, Spain and Sweden. About 5.4 million acres have been blackened in more than a dozen U.S. states during this year's extremely active wildfire season, according to the National Interagency Fire Center. Summer vacation travelers have likely had their getaway plans disrupted. Firefighters across California — a popular vacation destination — continue to battle at least 17 wildfires. Travel insurance comparison website, Squaremouth, says whether your home or travel destination is in the fire's path, travel insurance may be able to help. But before buying a policy, here are 3 things travelers don't know about coverage for wildfires, but should. Related: 7 common reasons travel insurance claims are denied