Black Canyon

The Black Canyon earns its name honestly: some sections of this canyon receive only 33 minutes of direct sunlight a day, deep enough and narrow enough that light rarely reaches the bottom. The Gunnison River has been carving through 1.8-billion-year-old Precambrian gneiss and schist for two to three million years, cutting a gorge that at its narrowest is only 40 feet wide at the bottom while dropping more than 2,000 feet, making it the deepest canyon in North America relative to its width.

The Painted Wall, visible from a South Rim overlook, is Colorado's tallest cliff at roughly 2,300 feet, its streaked pattern the result of molten rock squeezed into fractures over a billion years ago and long since cooled and hardened. Unlike the Grand Canyon, there's no easy trail to the bottom here; reaching the river requires a genuinely difficult scramble down loose, unmaintained routes that the park service treats as a serious undertaking, not a casual hike.

Come for the sheer scale of the depth-to-width ratio. Stay long enough to understand why this park, despite being every bit as dramatic as its more famous cousins, remains one of the least crowded in the system. Read the story, trust the live data above for what is open today, and when you leave, collect the stamp.