Some people are impossible to please.

While it might seem strange, given their beauty, it turns out that a few national park visitors aren't leaving their vacations satisfied at all. And they're taking to Yelp to voice their complaints.

See also: 14 Gorgeous Posters to Celebrate National Park Week

After being tipped off to the trend of one-star national park reviews via a tweet from journalist Tim Murphy, we decided to research the matter further. What we discovered is that bathroom problems, long lines and someone named Ranger Wiener plague the national parks of America.

Avoiding all obvious trolls, we've gathered a handful of real, honest Yelp criticisms of America's glorious national parks. Vacation at your own risk, folks.