K for Kumbhalgarh Fort near Udaipur built in the 15th century by Rana Kumbha. This fort boasts of a continuous 36km long wall which is said to be the second longest after the Great Wall of China. You can read more about Kumbhalgarh on Wiki which has an interesting story…
Quote from Wiki :
According to legend, in 1443, the Maharana of Kumbhalgarh, Rana Kumbha, was initially repeatedly unsuccessful in attempts to build the fort wall. A spiritual preceptor was consulted about the construction problems and advised the ruler that a voluntary human sacrifice would solve whatever was causing the impediment. The spiritual advisor advised building a temple where the head should fall, and to build the wall and the fort where the rest of his body lay. As can be expected, for some time no one volunteered, but one day, a pilgrim, or some versions suggest a soldier, and some the spiritual preceptor and the pilgrim were one and the same, volunteered and was ritually decapitated. Today the main gate of the fortress, Hanuman Pol, contains a shrine and a temple to commemorate the great sacrifice.
According to popular folklore, Maharana Kumbha used to burn massive lamps that consumed fifty kilograms of ghee and a hundred kilograms of cotton to provide light for the farmers who worked during the nights in the valley. Its wall is the second largest wall in Asia.
My experiences with the interesting guides in Kumbhalgarh is also documented here.