Hill Forts of Rajasthan

The six Hill Forts of Rajasthan, spread across Rajasthan state in northern India, clustered together as a designated UNESCO World Heritage Site. The forts are mainly based in the Aravalli Range, and were built and enhanced between the 5th and 18th centuries CE by several Rajput kings of different kingdoms. They comprise:
 * 1) Chittor Fort at Chittorgarh
 * 2) Kumbhalgarh Fort at Kumbhalgarh
 * 3) Ranthambore Fort at Sawai Madhopur
 * 4) Gagron Fort at Jhalawar
 * 5) Amer Fort at Jaipur
 * 6) 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.