5. Big Bend National Park – Texas
Big Bend is remote, vast, and scorching hot—especially in summer, when daytime temperatures often soar above 100°F (38°C). With a mortality rate of 1.55 deaths per 100,000 visitors, it’s considered one of the most dangerous U.S. parks.
Dehydration, disorientation, and snake bites are common hazards. Cell service is nearly non-existent, and some missing hikers have never been found despite search efforts.