The Ape Caves on the southern slope of Mount St. Helens in Washington State are an unforgettable subterranean adventure. Stretching over 2.5 miles, this vast lava tube—one of the longest in the United States—was forged around 2,000 years ago during a fiery volcanic eruption. Today, it offers explorers the chance to journey into the heart of ancient volcanic activity.

Split into two sections, the caves cater to adventurers of all levels. The lower cave, a relatively easy three-quarter-mile trek, is perfect for families and first-timers. But the upper cave is where the real thrill lies—a 1.5-mile journey through rugged terrain, rock piles, and tight passages that will challenge your endurance and spark your sense of wonder.

Inside, you'll discover incredible volcanic formations, from shimmering lava stalactites to the infamous "Meatball," a massive chunk of cooled lava suspended dramatically in the tube. The air is a brisk 42°F year-round, adding to the cave’s eerie allure.

Equipped with a flashlight, sturdy boots, and a spirit for exploration, you'll venture into a dark, otherworldly realm. Managed by the U.S. Forest Service, the caves are a protected treasure, offering a raw, untamed experience for those ready to embrace the wild beneath the earth’s surface.

This trip is a long day so pick up points are limited.