Rani ki vav, arguably the world's most impressive stepwell.
Simply put, Rani ki vav, or "The Queen's Stepwell," in the little northern Gujarati town of Patan, is one of the foremost man made wonders of India. The stepwell is generally thought to have been built by Queen Udayamati of the Solanki dynasty as a memorial for her deceased husband, Bhimadeva I, in the late 11th century. At the time, the Solankis ruled over much of what we now refer to as the state of Gujarat, and their reign is often viewed as a golden age in the history of the region.