The Basilica of the Nativity is one of the oldest Orthodox continuously operating churches in the world. The basilica is built, according to legend, over the birthplace of Jesus Christ in Bethlehem. The basilica is also one of the main Christian temples of the Holy Land. The Basilica building is a combination of two churches and is built over the cave in which Jesus was born. The cave is an underground temple. This place is considered sacred to Christians. The Basilica of the Nativity of Christ was laid by the Holy Empress Elena during her pilgrimage in the mid-330s to the Holy Land. The main entrance to the Basilica is called the Gate of Humility. An ordinary person can be entered only with his head bowed, as there is a narrow passage leading to the Basilica, which makes each person come to bow low, as if bowing to the Savior of the world. Today, the Basilica is ruled by three Christian denominations - the Armenian Church, the Roman Catholic Church and the Greek Orthodox Church. On July 29, 2012 the Basilica of the Nativity of Christ was inscribed on the World Heritage List.