
Grand Canyon National Park: A strange series of events in Grand Canyon National Park leads researchers to speculate whether its power comes from forces that cannot be explained. (S1, ep 1)

Chaco Culture National Historical Park: Built by the ancient Anasazi, spooky sightings in this national park include shape-shifting creatures and time-traveling Wingmakers. (S2, ep 7)

Yosemite National Park: The infamous Yosemite National Park has a darker side that includes mysterious sightings, disappearances and even a prehistoric pterodactyl. (S2, ep 8)