In 1859, prospector John H. Gregory panned nearly $1,000 of gold dust from a gulch 40 miles west of Denver in what became known as “The Richest Square Mile on Earth.” Indeed, the hills surrounding the towns of Central City and Black Hawk yielded tons of the precious metal, and fortune seekers hoping to share the bonanza descended on the region. A century and a half later, visitors still venture here looking for "gold."