In the 1950s, two climbers based at Camp 4 waged a rivalry that would define the ethics and ambitions of American rock climbing for decades. Royal Robbins was scholarly and precise, a man who believed that how you climbed mattered more than whether you reached the top. Warren Harding was his opposite - brash, hard-drinking, and willing to use whatever means necessary to get up the rock. In 1957, Robbins made the first ascent of the Northwest Face of Half Dome, a feat of technical brilliance. Harding responded with the first ascent of El Capitan via the Nose, a forty-seven-day siege spread over eighteen months that ended on November 12, 1958. His team - Wayne Merry and George Whitmore among them - used some 600 pitons and 125 expansion bolts and enough fixed rope to rig a small ship. Robbins thought the style was crude. Harding thought style was beside the point. Both were right, and their argument - clean versus siege, purity versus results - still echoes through every climbing gym and alpine club in the world.

By the 1970s, a new generation had taken over Camp 4. Jim Bridwell and his crew, who called themselves the Stone Masters from 1973 to 1980, brought an athletic ferocity that made the Golden Age climbers look genteel. Free climbing - ascending using only hands and feet on the rock, with gear only for safety - replaced the aid-heavy techniques of the previous era. The Stone Masters trained like athletes, climbed like artists, and lived like vagrants. They perfected the dirtbag lifestyle that Camp 4 would become synonymous with: subsisting on cheap food, sleeping in the dirt, spending every available hour on the walls. Beverly Johnson, who in 1973 was part of the first all-female ascent of El Capitan, proved that the granite didn't care about gender. The 2014 documentary Valley Uprising captured this era's rebellious energy, featuring veterans of Camp 4 and chronicling the decades-long tension between climbers who saw the valley as a playground and a Park Service that saw them as a management problem.

In the 1990s, Camp 4 faced an existential threat from the institution that administered it. After severe flooding in 1997 destroyed employee housing units throughout Yosemite Valley, the National Park Service proposed building a three-story dormitory complex on land adjacent to Camp 4. The climbers saw this as a death sentence - not for the campsites themselves, necessarily, but for the wild, unstructured character that had made the camp a creative incubator for fifty years. Tom Frost, a pioneering climber and climbing equipment manufacturer, filed a lawsuit against the Park Service, arguing that the construction would disturb the camp's natural setting. The American Alpine Club joined the suit. The legal battle drew national attention and forced a question that national parks rarely confront: can a place derive its historical significance not from buildings or battlefields but from the culture of the people who slept on the ground there? The answer, ultimately, was yes. Camp 4's 2003 listing on the National Register of Historic Places made the argument official.

Camp 4 is not entirely safe, and the park knows it. A 2012 rockfall hazard report concluded that several campsites on the northern side of the campground needed to be relocated due to the risk of rocks peeling off the cliffs above. This is the paradox of the place: the same granite that draws climbers from around the world also threatens anyone who sleeps at its base. Yosemite's walls are still actively exfoliating, shedding sheets and blocks as the rock adjusts to the pressures that glaciation left behind. Campers at Camp 4 fall asleep to the occasional crack and rumble of stone finding a new resting place. It is a sound the valley's climbing community has always lived with - an ambient reminder that granite is not as permanent as it looks. The walls will outlast everyone who climbs them, but they are not standing still. Neither is the campground. What started as an overflow site for post-war tourists became the cradle of a global sport, then a legal battleground, and now a living monument. Ten dollars a night.