The North Western Indian State of Rajasthan has over one hundred fortifications on hills and mountainous terrain. Six Hill Forts of Rajasthan, spread across Rajasthan state in northern India, have been clustered as a series and designated UNESCO World Heritage Site. The ‘Hill Forts of Rajasthan’ was initially submitted to the UNESCO as a serial property formed by five Rajput forts in the Aravalli Range, and were built and enhanced between the 5th and 18th centuries CE by several Rajput kings of different kingdoms. The UNESCO series has been increased to six forts. They consist of:
Chittor Fort at Chittorgarh
Kumbhalgarh Fort at Kumbhalgarh
Ranthambore Fort at Sawai Madhopur
Gagron Fort at Jhalawar
Amer Fort at Jaipur
Jaisalmer Fort at Jaisalmer
Some of these forts have defensive fortification wall up to 20 km long, still surviving urban centers and still in use water harvesting mechanism.