Washington’s Olympic National Park protects the longest wilderness coastline remaining in the continental United States, and the season for hiking it is fast approaching. Watch this short video of a classic, three-day, 17.5-mile backpacking trip along the southern section of the coast, where you’ll see sea stacks rising out of the ocean, seals, sea otters, and tide pools filled with sea life. Read the story and check out a gallery of photos from the adventure.