Facebook CEO Mark Zuckerberg checked in at the Taj Mahal on his visit to India.In a Facebook post from the Indian city of Agra, Zuckerberg said he had always wanted to see the famous white marble mausoleum built in the 1600s by the Mughal emperor Shah Jahan for the tomb of one of his wives. Zuckerberg marveled at the structure, calling it "even more stunning than I expected.""It`s incredible what people can build — and what love can motivate us to build," Zuckerberg wrote.Zuckerberg is in India to deepen ties with the South Asian nation, which is home to the greatest number of Facebook users outside the USA. Indian Prime Minister Narendra Modi paid a visit to Facebook headquarters in Menlo Park, Calif., in September.