India, Feb. 19 -- Great poet Mirza Ghalib was born in the city of Taj Mahal, that Mughal-era marble monument to romantic love. His karam-bhoomi however was Delhi, where he spent his long life composing poems on pyar-prem-ishq. But here's the irony. Ghalib did not compose a single ghazal on the lovely Taj. Even so, his grave in Delhi stands beside the world's first Mughal monument built entirely of marble. That said, while Delhi is a city crowded with monuments, only a few of them are constructed entirely of marble, though many monuments incorporate it among other materials. The city's handful of all-marble structures includes the Moti Masjid inside the Red Fort, the Diwan-i-Khas within the same complex, the second Moti Masjid at Zafar Mahal...