“ Find a national park and come visit!” the annual event’s webpage encourages, pointing to the 433 “parks” across the National Park System, including national battlefields, monuments and seashores – not just places with National Park in their name like Great Smoky Mountains or Yosemite .

Firings, buyouts and a lack of seasonal workers could mean jammed roads, closed campgrounds, limited hours and more. What you need to know before traveling to 10 popular parks.

Three Vermont state parks were named among the country's most popular parks for families, according to a recent poll.