Rio 2016 Paralympic Games closing ceremony

Fireworks erupt marking the beginning of the closing ceremony of the Rio 2016 Paralympic Games at Maracana Stadium on September 18, 2016 in Rio de Janeiro, Brazil.

AP PHOTOS: Islamic site near Mecca among few still preserved

Just outside the city of Mecca in Saudi Arabia lies one of Islam's most important historical sites — a cave where, according to tradition, the Prophet Muhammad spent time in seclusion, contemplation and self-reflection.

It was here, inside Hira Cave located near the top of a steep hill called Noor Mountain, where Muslims believe God revealed to the prophet the first verses of the Quran through the angel Jebril, or Gabriel as he is named in English.

AP PHOTOS: A selection of pictures from the past week

A plane takes off from Washington's Ronald Reagan National Airport as Julia Hurley of Washington relaxes on a picnic table at Gravelly Point Park in Arlington, Va., Wednesday, June 8, 2016, after bicycling to Mt. Vernon and back.

World heavyweight championship between Muhammad Ali and George Foreman

This is a Oct. 30, 1974 file photo of Muhammad Ali as he watches George Foreman head for the canvas after being knocked out in the eighth round of their match in Kinshasa, Zaire. It was nearly 42 years ago that two men met just before dawn on Oct. 30, 1974, to earn $5 million in the Rumble in the Jungle. In one of boxing's most memorable moments, Muhammad Ali stopped the fearsome George Foreman to recapture the heavyweight title in the impoverished African nation of Zaire.

Muhammad Ali (January 17, 1942 – June 3, 2016)

A portrait of then World boxing heavyweight champion Muhammad Ali in 1960 in Paris, France.

AP PHOTOS: A selection of pictures from the past week

An Ultra-Orthodox Jewish boy watches a bonfire during the Lag Ba'Omer celebration in Jerusalem on Wednesday, May 25, 2016. The holiday marks the end of a plague said to have decimated Jews during the Roman times.

AP PHOTOS: A selection of pictures from the past week

Lightning flashes in the sky behind the Gateway Arch, right, and the Old Cathedral, left, as a line of thunderstorms moves through St. Louis, Wednesday, May 11, 2016. Thousands of Ameren Corp. customers in the St. Louis area lost power after the strong thunderstorm hit the region. 

AP PHOTOS: A selection of pictures from the past week

A bullfighter "picador" prepares to use his lance as he rides his horse in front of a Los Rodeos ranch's bull during a bullfight at Las Ventas bullring in Madrid, Spain, Sunday, April 24, 2016.