Rani-ki-Vav is the UNESCO World Heritage Site in India known for its monumental 11th-century stepwell. It stands in Patan, Gujarat, on the banks of the Saraswati River.
The stepwell was commissioned by Udayamati in memory of her husband, King Bhima I of the Chaulukya, or Solanki, dynasty. Rather than being only a water structure, it was designed as an elaborate subterranean temple, with descending levels, galleries and hundreds of sculptures.
Many carvings depict Hindu deities, celestial beings and scenes from religious traditions. The seven levels descend toward the water, while the architectural design creates a long ceremonial experience underground.
Rani-ki-Vav was inscribed on the World Heritage List in 2014. It is sometimes confused with Gujarat’s Adalaj Stepwell, which is also famous but is a different monument and is not the UNESCO site named in this question.