Al Saleh Mosque, Yemen

Photograph by Stephanie Sinclair , National Geographic

Lights atop the 300-foot minarets at four-year-old al Saleh Mosque glow during a storm in Sanaa. The $60 million house of worship is Yemen 's largest and most extravagant, named for Ali Abdullah Saleh, who stepped down in February after 33 years as president. It opened with claims of promoting moderate Islam. But militant groups have only gained strength.

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