It’s National Park Week which means that entry to all 397 national parks, monuments, and historic sites across the United States (and Puerto Rico) is totally free. This annual event is put on by the National Park Foundation, the official charity of the National Parks (see the story we did about park funding for National Geographic Traveler to learn more about why our national parks need an official charity).
The locations included in the United States National Park System represent some of the most spectacular and largest (87 million acres) tracts of protected land on the planet. The first two years of our Trans-Americas Journey were spent in the United States where we visited 123 National Parks, National Monuments, and National Historic Sites. The photo montage, below, includes shots taken as we entered 68 of them.
Here’s more about travel to US National Parks & Monuments