Stepwells are wells, cisterns or ponds with a long corridor of steps that descend to the water level. Stepwells played a significant role in defining subterranean architecture in western India from the 7th to the 19th century. From Wikipedia
The ancient structure, registered as 'Bilari ki Rani ki Bavadi,' was discovered during excavation following the reopening of a Shiv-Hanuman temple closed for 46 years.
