Chapman's Peak Drive was carved from the mountain between 1915 and 1922, a feat of engineering that required blasting a narrow shelf into near-vertical rock. The road hugs the cliff face for nine kilometers, threading between Hout Bay to the north and Noordhoek to the south, with the Atlantic churning far below. When it opened on 6 May 1922 - inaugurated by Prince Arthur of Connaught, then Governor-General of the Union of South Africa - it was considered one of the great road-building achievements of its era. Every meter had been won by hand and dynamite from a mountain that did not want to cooperate. The road climbs, dips, and curves through 114 bends, each one revealing a different angle on the coastline, the ocean, or the peaks above.

The geology of Chapman's Peak tells a story that dwarfs human history. The summit consists of flat sedimentary sandstone, the same formation that caps Table Mountain - rock laid down over 600 million years ago. But the base of the mountain is Cape Granite, an entirely different formation, and the two meet at a geological unconformity that is famous among earth scientists worldwide. This boundary line is visible from the road: above it, the layered sandstone weathers into horizontal shelves; below it, the granite erodes into rounded, rougher forms. Two endangered vegetation types grow along the road, each corresponding to one of these geological zones - Peninsula Sandstone Fynbos on the upper slopes and Cape Granite Fynbos below. Both are endemic to the city of Cape Town and exist nowhere else on Earth.

The mountain giveth and the mountain taketh away. In the 1990s, a rockfall killed a motorist, and the resulting lawsuit shut Chapman's Peak Drive for years. Engineers redesigned sections of the road with concrete canopies and rockfall shelters - visible today as half-tunnels bolted to the cliff - and it reopened in 2005 as a toll road, part of the M6. In June 2008, it closed again after inspectors identified new risk areas on the slopes above. Each closure reminds drivers that the road is borrowed space, a thin ribbon of asphalt on a mountain that continues to shed rock as it has for millions of years. The drive remains part of the route for two of South Africa's largest mass-participation sporting events: the Cape Argus Cycle Race and the Two Oceans Marathon.

On the northwestern slopes of Chapman's Peak, hidden from the tourist viewpoints, lie the remains of a manganese mine. The workings are long abandoned, but the ruins of a jetty from which ore was shipped still cling to the rocks directly below. It is a reminder that the Cape Peninsula was not always a playground. Before the drive brought sightseers, before the toll booths and the cycling races, people came to this mountain to extract what they could from the earth. The mine is gone, but the jetty pilings endure, slowly surrendering to the same ocean that has been carving the cliff face since long before John Chapman stepped ashore.