A secret underground Nazi base may be the reason for UFO sightings inMontana's Glacier National Park. It may also be the final hideout for Adolf Hitler himself.

Ultimately, most incidents could be easily explained, but not all. Today, you can visit the scene of the first modern UFO sighting at Mount Rainier National Park, 60 miles south of Seattle.

4 novels of murder, set in the picturesque beauty of national parks Fiction: From Alaska to Hawaii, backpacking characters must watch their backs in mysteries from Nicole Maggie, C.J. Box and more.