National parks across the U.S. are overflowing with a post-pandemic crush of tourists, leading to increased issues with congestion, traffic jams, user experience, strain on staff and increased damage to the parks.

Why it matters: Some are seeing such a record number they’re being forced to limit, and even close, access to certain areas to avoid the danger of eroding the land. The result, ultimately, could change the way Americans interact with the parks going forward.

By the numbers: The chart above shows how the most popular national parks enjoyed millions of more visitors in 2021 relative to last year, in part thanks to the relaxing of coronavirus restrictions.