In 1886 a prospector named George Harrison stumbled onto an outcrop of gold-bearing rock on a farm called Langlaagte, on the long ridge the Afrikaners called the Witwatersrand, the ridge of white waters. Word spread, fortune-seekers poured in, and within a decade a chaotic mining camp had become Johannesburg, the largest city in southern Africa. The gold lay not in convenient nuggets but in a thin, stubborn reef that plunged for miles into the earth, so the mines could not skim the surface; they had to follow the seam down, and down, until some became among the deepest holes humans have ever dug. That hunger for deep labor shaped the whole region, drawing migrant workers from across southern Africa into a brutal mining economy whose racial divisions would later harden into apartheid itself. Gold Reef City sits on the site of shaft number one, where it all began. Its mock-Victorian streets, its preserved headgear and stamp mills, recreate the boomtown era when the reef was young and the whole world wanted in.

The park leans into its setting with a collection of rides that are genuine curiosities. The Anaconda is described as the world's only inverted coaster built by the Swiss firm Giovanola. The Golden Loop, a Schwarzkopf shuttle-loop coaster, began life as White Lightnin' at the Carowinds park in the United States before crossing the Atlantic. Jozi Express races along track built by the German maker Zierer. And the Tower of Terror once claimed the highest g-force of any roller coaster, around 6.3 g, before a refurbishment brought that figure down to around 4 g, as it pitches riders into that old mine shaft. Water rides, a Ferris wheel, and a casino round out the attractions, all dressed in the gold-rush theme that gives the place its name.

The mine below is not entirely tamed. In 2013 it was reported that acidic water, a notorious legacy of the abandoned workings that honeycomb the Witwatersrand, was slowly rising inside the shaft, raising the prospect that the park could one day be flooded if nothing were done. Underground mine tours were halted, and the gold-mining museum, which let visitors watch molten gold poured glowing into a mold, was relocated from 215 meters below ground to 80 meters above it. The episode was a reminder that beneath the rides and the recreated saloons lies a real and restless industrial past, the same deep earth that built and haunts Johannesburg.

Gold Reef City carries a heavier neighbor than its roller coasters. When the casino was licensed, the developers were required as a condition of approval to fund a museum, and in November 2001 the Apartheid Museum opened beside the park. It has since become the foremost museum on twentieth-century South African history, a sober and powerful journey through the rise and fall of racial segregation. Visitors are issued a ticket randomly marked white or non-white and must enter through the corresponding gate, a small jolt of arbitrary classification that sets the tone for everything inside. The galleries trace the pass laws, the forced removals, and the long resistance that finally brought the system down. The juxtaposition with the park is jarring and somehow honest: a fairground of gold-rush nostalgia and, a short walk away, an unflinching reckoning with what that gold and that city cost the people who dug it. To visit one is, almost inevitably, to confront the other.