Situated amid the suburban homes of the Oxgangs neighborhood, a 20-minute drive from the city center, stands an imposing boulder of red sandstone measuring over 9 feet (2.75 meters) high, 5 feet (1.55 meters) wide, and 1 foot (0.48 meters) thick. It’s believed the stone has stood in this spot for at least 5,000 years and has witnessed the ever-expanding populace of the nation’s capital. In fact, it’s easily missed by the naked eye, as the stone is engulfed by the neighboring domestic surroundings. The Caiy Stane goes by several…