Гихон
The hard dolomite rock around the Gihon Spring pool is honeycombed with natural karstic fissures, through which groundwater percolates. At various times, some of these fissures were utilised as aids in the digging of tunnels and channels to control the flow of subsurface water, and especially that of the Gihon Spring. Many different opinions have been expressed on the dating, history and function of these tunnels since they were first explored in the 19th and early 20th centuries.