16.5 meters long
dragon staircase slab at the
Forbidden City in Beijing
is monolithic and said to weigh around 250 tonnes. It was brought in from
outside Beijing and transported in winter by creating ice patches on land by
pouring water on the freezing soil, resulting in an ice road over which it could then be slid.
About 20,000 workers were involved in moving the slab along the track and in
order to get a sufficient amount of water, a well was dug every 500 meters.