An Indian Muslim Sufi devotee uses a sharp objects as he self flagellates during a procession to the revered Muslim Shrine of Ajmer Sharif during the Urs Festival in Ajmer, Rajasthan on May 21.

An Indian Muslim Sufi devotee dances with a band during a procession to the revered Muslim Shrine of Ajmer Sharif during the Urs Festival in Ajmer, Rajasthan.

A man prays during the "Rogativa por la Lluvia" or Prayer for Rain ceremony at Chicabal Lagoon in San Martin Sacatepequez, Guatemala.

An offering of flowers and a cross are seen during a downpour on the shore of the Chicabal Lagoon in Guatemala. The lagoon was formed on the crater of a former volcano and considered by Mayan people as a sacred place.

A woman prays as she shields herself from the rain during a Mayan rain ceremony on the shore of the Chicabal Lagoon in San Martin Sacatepequez, Guatemala.

A woman heats tortillas over an open fire while shielding herself and a child from a light drizzle during the Prayer for Rain ceremony.

A drunken man sleeps face down after attending a Mayan rain ceremony on the shore of the Chicabal Lagoon.

Holocaust survivors wearing 'Talit' (prayer shawls) and 'Tefilin' (phylacteries), sit in a synagogue during a Bar Mitzvah ceremony on May 17, 2012 in Ashkelon, Israel.

A Holocaust survivor whose number tattoo is still visible puts on the 'Tefilin' during the ceremony.

Ultra-Orthodox Jews stand next to bonfires during Lag Ba'omer celebrations to commemorate the end of a plague said to have decimated Jews in Roman times, in Bnei Brak, Israel, on May 9, 2012.

A young boy watches a bonfire burn as Orthodox Jews of the Satmar Hassidim dance and celebrate the Jewish holiday of Lag Ba'omer in the village of Kiryas Joel, Orange County, New York, on May 9, 2012.

Ultra-Orthodox Jewish boys sit in front of girls and women as they look at a bonfire lit on the Jewish holiday of Lag Ba'omer in Jerusalem's Mea Shearim neighborhood on May 9, 2012.

Men of the Orthodox Jewish Satmar Hassidim crowd the steps of a synagogue (backround) as women of the sect stand in a separate area (front) as they celebrate Lag Ba'omer in the village of Kiryas Joel, New York, on May 9, 2012.

An ultra-Orthodox woman prays during traditional festivities for Lag Ba'omer near the grave of Rabbi Shimon bar Yochai on Mount Meron in northern Israel on May 10, 2012.

Stanhope Elmore High School Junior ROTC Cadet Mike Snyder bows his head in prayer during National Prayer Day ceremonies at the Dexter Avenue United Methodist Church in Montgomery, Ala.

Patty Russo, of Melbourne, Iowa, and her husband Joe, left, pray during a National Day of Prayer gathering in the rotunda at the Iowa Statehouse on Thursday. Congress established the day of prayer in 1952 and in 1988 declared that it would be held every year on the first Thursday in May.

Kelly Boorse, left, and Francisca, right, join others during a National Day of Prayer event, Thursday at City Hall in San Antonio. Congress established the day of prayer in 1952 and in 1988 declared that it would be held every year on the first Thursday in May.

Members of the Pearl, Miss. Fire Department, from left, Pvt. Jeremy Rast, Lt. Ronnie Decell and Capt. Alvin Morris participate in a National Day of Prayer observance by the flagpole at Miskelly Furniture in Pearl, Miss. on Thursday, May 3. A brisk wind kept the flag flying strong and at half-mast for Pearl Police Investigator Mike Walter killed Tuesday, May 1 in the line of duty.

A Buddhist nun speaks with novice Thai nuns at the Sathira Dammasathan Buddhist meditation centre in Bangkok on April 20. (All images captured by Sukree Sukplang of Reuters on April 20)

Novice Thai nuns walk in line at the Sathira Dammasathan Buddhist meditation centre in Bangkok.

Novice Thai nuns play at the Sathira Dammasathan Buddhist meditation centre in Bangkok.

Novice Thai nuns stand in line to receive food from people at the Sathira Dammasathan Buddhist meditation centre in Bangkok.

A Buddhist nun prays with novice Thai nuns at the Sathira Dammasathan Buddhist meditation centre.

Children dressed in traditional Bavarian costumes dance for Pope Benedict XVI during the Pontiff's 85th birthday celebrations in the Clementine Hall on April 16 in Vatican City, Vatican. Numerous visitors joined Pope Benedict in the celebrations, including his older brother and the premier of his native German state of Bavaria. Benedict, who took that name following his election on April 19, 2005, was born as Joseph Ratzinger on April 16, 1927 in the town of Marktl am Inn, Bavaria.

Russian Orthodox believers celebrate Easter at the Christ the Savior Cathedral in Moscow on April 14.