How'd They Do That? The Story Of A Giant Rock And A Road Of Ice

Huge stone slabs weighing up to 300 tons that now reside in Beijing's Forbidden City were slid more than 40 miles in 15th- and 16th-century China over water-lubricated ice roads in the dead of winter. Though spoked wheels had been around for almost 3,000 years, the ice roads were smoother and required less manpower.

Source: http://www.npr.org/2013/11/04/242305465/howd-they-do-that-the-story-of-a-giant-rock-and-a-road-of-ice?ft=1&f=1007

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