Located on a lonely mountain plain in Colorado ski country, the silver-rush-era town of Leadville holds secrets as deep as its tunnels and old mine workings.

North America is the third largest continent in the world. It is located in the Northern Hemisphere. The north of the continent is within the Arctic Circle and the Tropic of Cancer passes through ...

At 3,109m (10,200ft), it's the highest incorporated city in North America. But while the town ... The first mineral deposits were found in the area's California Gulch in 1860, and, within a ...