Astronomical fall begins on Monday, meaning the farewell to summer begins this weekend. So, why not visit one of our nation’s beautiful and majestic @nationalparkservice ? @mammothcavenps Ranger Molly Schroer joined FOX Weather on Sept. 17 to explain why Mammoth Cave is worth the visit anytime of the year. #foxweather #mammothcave #mammothcavenationalpark #nationalpark #us #outdoors #recreation #nature #kentucky