Kumbhalgarh, second longest wall in the world - Rajasthan, India - a world heritage site.
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Built on a hilltop 1,100 m (3,600 ft) above sea level on the Aravalli range, the fort of Kumbhalgarh has perimeter walls that extend 36 km (22 mi), making it one of the longest walls in the world.The frontal walls are fifteen feet thick.
Kumbhalgarh Fort