Imagine a mass of lava 400 feet deep flowing like a river for three miles. As the lava slowly cooled from the outside toward the middle of the flow, ideal conditions caused the lava to crack into long post-like columns. During the last major ice age, which ended about 10,000 years ago, a glacier sculpted away the top layers of lava. It revealed the internal fractured lava mass and exposed a wall of columns 40 to 60 feet high. Some say it resembles a giant pipe organ.
Shuttles have racks which accommodate backpacks.