Gua Kelam is one of Malaysia's most distinctive caves, with its story beginning over 100 million years ago within the Nakawan Range. Its name, which means "Dark Cave" in Malay, was coined by early miners who spent their days in near-total darkness, using only carbide lamps to find the high-quality alluvial tin that once filled the cavern. The cave’s modern transformation began in 1935 when an Englishman, Sir John Campbell, realized that the natural underground stream could be used as a transportation route. He oversaw the construction of an eight-foot-wide wooden suspension bridge, which served as a shortcut for miners to move ore from the valley to the town of Kaki Bukit. Beyond mining, the cave has witnessed various historical chapters, including serving as a passage for residents traveling to the Thai border, a hideout for communist guerrillas, and a route for smugglers. Today, it stands as a celebrated ecotourism site that preserves the "Stone Age" mystery and the grit of Malaysia's mining heritage.