The site first appears to have been settled during the Pre-Pottery Neolithic B period, approximately 8800 to 7000 BC. Neolithic remains of some buildings can be observed at the site. According to the writer Philo of Byblos (quoting Sanchuniathon, and quoted in Eusebius), Byblos had the reputation of being the oldest city in the world, founded by Cronus. During the 3rd millennium BC, the first signs of a town can be observed, with the remains of well-built houses of uniform size. This was the period when the Canaanite civilization began to develop.

Upper Grotto A visit on foot with an exciting adventure over a distance of some 700 m from the cave’s total length of 2200 m will stun the visitor with the spectacular beauty of the extraordinary amazing limestone formations. Lower Grotto A short dreamy boat trip over a distance of some 400 m from the cave’s total of 7800 m will captivate the visitor carrying him to another world full of peace and haunting splendor.

Harissa is a key Christian pilgrimage site with a shrine dedicated to Our Lady of Lebanon (Notre Dame du Liban). In 1904, Patriarch Elias Hoyek, on the 50th anniversary of the proclamation of the Dogma of the Immaculate Conception, announced the foundation of the building of Our Lady of Lebanon. The shrine belongs to the Maronite Patriarchate who entrusted its administration to the Congregation of Maronite Lebanese Missionaries since its foundation in 1904. The original church was built by Sleiman Yakoub Hokayim from Batrun. The mountain is called Harissa (after the village at the peak of the mountain). When it was inaugurated in 1908 the Patriarch dedicated Lebanon to the Virgin Mary: "Oh Mary, Queen of mountains and seas and Queen of our beloved Lebanon ...” Patriarch Hoyek designated the first Sunday in the month of May as the Feast of Our Lady of Lebanon. On this day the Maronite Patriarch and all the Lebanese Bishops celebrate the Divine Liturgy in the open air at the Shrine of Our Lady of Lebanon.