Contrary to its name, the Fiery Furnace is not a hot place. Named for the warm glow seen on the rocks in late afternoon, the Fiery Furnace is actually a maze of cool, shady canyons between towering sandstone walls. The chaos of fins, spires and canyons has been called "void, silent and almost uncanny in its solitude." The many vertical rock walls - or fins - you see here are the result of movement, eons ago, far beneath the earth's surface. Over time erosion has been shaping the Fiery Furnace. Rain, snow and ice have deepened and widened the cracks, creating these towering fins.