The different ways we pray

Ancient Egyptian prayer - Relief depicting Akhenaton and his family worshipping Aten, the disc of the sun and originally an aspect of Ra, the sun god in traditional ancient Egyptian religion.

Quaker prayer meeting - A Quaker prayer meeting in France in the mid-1700s. Quakers are members of a group with Christian roots that began in England in the 1650s.

Quaker prayer - An engraving depicting General George Washington kneeling in prayer while his soldiers camp in the background at Valley Forge, Pennsylvania, during the winter of 1777.

Praying to the sun - Big Spring, a South Piegan Blackfoot chief, raises his arms in prayer to the sun in the 1880s.

Sufi prayer - Sufism is mysticism in Islam. Some Sufis whirl when praying or meditating.

Christian prayer - A 1950s congregation of devout men, women, and children sitting together in church pews with heads bowed in prayer.

Jewish prayer - Orthodox Jews praying at the Western Wall in the Old City of Jerusalem, Israel. The wall, also known as the Wailing Wall, is the holiest site in Judaism.

Buddhist prayer - Buddhist monks and worshippers gather at the tooth sanctuary in Sri for the exposition ceremony of the relic of the tooth of Buddha.

Christian prayer - Two well-dressed children attend church in the 1960s and pray together.

Hindu prayer - Hindus say prayers next to the holy River Ganges in Varanasi, India.

Christian prayer - Youngsters pictured in 1963 at Laxton Junior School in Peterborough, England, joining their headmistress in the Lord's Prayer.

Sikh prayer - A Sikh devotee in prayer and meditation at the Golden Temple (in Amritsar, India), Sikhism's holiest of places.

Christian prayer - An American family in the 1950s saying grace before a Thanksgiving meal.

Christian prayer - A priest of the Congregation of the Holy Cross leads a Catholic family in prayer at a mining village in County Durham, England, in the early 1950s.

Muslim prayer - An Indian Muslim devotee offers prayers during Eid al-Adha, or the Festival of Sacrifice, which marks the end of the Haj, at Jama Masjid in New Delhi, India.