The Rani ki Vav in Patan is a famous example of a:

The Rani ki Vav in Patan is a famous example of a stepwell. A stepwell is a type of well that is constructed with a series of steps leading down to the water level. Stepwells are often found in arid regions, where they provide a source of water for drinking, bathing, and irrigation. They can also be used as places of worship and social gathering.

The Rani ki Vav is one of the largest and most elaborate stepwells in India. It was built in the 11th century by Queen Udayamati, the wife of King Bhimdev I