Jeita Grotto is a cave you tour by boat, on the river that gives Beirut its drinking water. It has two levels. The lower gallery runs 6,200 metres and still carries the river, and electric boats take visitors 500 metres along it. The dry upper gallery above is 2,130 metres long, about 750 of them open on a raised walkway. Up there the ceilings climb past 100 metres, hung with stalactites, floored with stalagmites and pillared where the two have grown into one another. An 8.2-metre stalactite hangs in the White Chamber. The whole system was dissolved out of limestone by the same spring water, in the Nahr al-Kalb valley 18 kilometres north of the capital.
Inside, the air is cool and almost saturated, and the loudest sound is dripping water. The lighting is careful rather than theatrical, pulling amber, cream and coffee bands out of the calcite and leaving the far chambers dark, so the scale reaches you slowly. The boat is what people remember. It slides out onto black water, the strokes echo under the dome, and the lit stone doubles upside down in water so still it reads as glass. A missionary, William Thomson, rediscovered the cave in 1836, and engineers from Beirut's water company pushed a kilometre inside in 1873. The lower gallery opened to visitors in 1958 and the upper in 1969. War then took Jeita out of reach for seventeen years: it closed in 1978, the galleries were used to store munitions, and it reopened only in 1995. It reopened again in July 2025 after eight months of maintenance. Cameras and phones are handed in at the door, so whatever you take away from Jeita you carry in your head.