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Tribal fighters loyal to Yemen's government and children pose for a picture in Al Khurais village of Nihm district east of the capital Sanaa January 11, 2016.

Ali Owidha/Reuters

Tribal fighters loyal to Yemen’s government and children sit on a rock in Al Khurais village of Nihm district east of the capital Sanaa on Monday

Visitors react on the rock as a man jumps into the water, above Cleopatra's Beach, on a summer s day before the start of the holy month of Ramadan, which begins on June 18, at the Mediterranean city of Marsa Matrouh...Visitors react on the rock as a man jumps into the water, above Cleopatra's Beach, on a summer s day before the start of the holy month of Ramadan, which begins on June 18, at the Mediterranean city of Marsa Matrouh, northwest of Cairo, Egypt.

Amr Abdallah Dalsh/Reuters

Visitors react on the rock as a man jumps into the water, above Cleopatra’s Beach, on a summer s day before the start of the holy month of Ramadan at the Mediterranean city of Marsa Matrouh, northwest of Cairo, Egypt

Professional photo guide Vincent Lawrence of Seal Harbor, Maine, left, and his client Frank Gallagher, of Silver Spring, Md., move to a new position while photographing the rocky coast of Maine's Acadia National Park at dawn, Friday, Oct. 3, 2014. A 15-inch-high rock cairn stands in the foreground.

Robert F. Bukaty/AP

A Professional photo guide and his client move to a new position while photographing the rocky coast of Maine’s Acadia National Park at dawn on Friday

An Orthodox Christian walks between the famous monolithic rock-cut churches during a Good Friday celebration in Lalibela May 3, 2013.

Goran Tomasevic/Reuters

An Orthodox Christian walks between the famous monolithic rock-cut churches during a Good Friday celebration in Lalibela, Ethiopia.