Patan, GUJARAT/INDIA - 25 JUNE 2014 : 'Rani-ki-Vav', an 11th century stepwell in Gujarat, has been approved as a World Heritage Site by UNESCO which described it as exceptional example of technological development in utilising ground water resources.Rani Ki Vav is amongst the finest stepwells in India, and one of the most famous legacies of the ancient capital city. The Rani-ki-Vav (the Qu