Part of old stone bridge, Anuradhapura, Sri Lanka.

Bridges were constructed out of cut pieces of granite and supported on columns of granite. These were held in place by mortise type of locks, cut in the granite slabs themselves. The photo shows a stone bridge of the Anuradhapura period (5th Century AD)m in Anuradhapura, Sri Lanka. Photo by Charaka Wickremasinghe.