A tourist views rocks in Mabaj Grotto, a natural scenic spot in Byblos district, about 50 kilometers north of Beirut, Lebanon, on Aug. 17, 2019. (Photo by Bilal Jawich/Xinhua)

A tourist views rocks in Mabaj Grotto, a natural scenic spot in Byblos district, about 50 kilometers north of Beirut, Lebanon, on Aug. 17, 2019. (Photo by Bilal Jawich/Xinhua)

The photo taken on Aug. 17, 2019 shows the interior of Mabaj Grotto, a natural scenic spot in Byblos district, about 50 kilometers north of Beirut, Lebanon. (Photo by Bilal Jawich/Xinhua)

A tourist touch a drop of water in Mabaj Grotto, a natural scenic spot in Byblos district, about 50 kilometers north of Beirut, Lebanon, on Aug. 17, 2019. (Photo by Bilal Jawich/Xinhua)

The photo taken on Aug. 17, 2019 shows the interior of Mabaj Grotto, a natural scenic spot in Byblos district, about 50 kilometers north of Beirut, Lebanon. (Photo by Bilal Jawich/Xinhua)

Tourists tour Mabaj Grotto, a natural scenic spot in Byblos district, about 50 kilometers north of Beirut, Lebanon, on Aug. 17, 2019. (Photo by Bilal Jawich/Xinhua)

A tourist touches rocks in Mabaj Grotto, a natural scenic spot in Byblos district, about 50 kilometers north of Beirut, Lebanon, on Aug. 17, 2019. (Photo by Bilal Jawich/Xinhua)