There are living things on this planet which defy the passage of time, surviving harsh winters, burning dry summers, and altering climate. These hardy, gnarly lifeforms are the bristlecone pines, trees that can live for thousands of years. At Great Basin National Park, you can hike the Bristlecone Grove Trail to pay your respects to these “elders.”

While it’s great to travel to and explore new units of the National Park System with your camera, it’s also great to revisit your favorite parks and return to photograph favorite spots at view areas and along the trail. Why? Because quite often, this same favorite spot may look quite a bit different depending upon the season, time of day, or weather conditions.

It’s time to test your knowledge about the 424 units of the National Park System. How much do you really know? Try answering these quiz questions before looking at the bottom of the piece. You might learn something totally new from the questions and bits of trivia. There’s so much to learn about the parks!

Beginning May 26, Mount Rainier National Park in Washington state will transition to a fully cashless fee system and will accept only electronic card payments for entrance fees and campgrounds.