Ranikot fort

Ranikot fort is worlds largest for and 2nd longest wall after the great wall of china. It is also known as The great wall of sindh "Sindh jee azeem diwar" It's length is 26 kilometers (16mi).It is a very important virsa of Pakistan

Location
It's located in Jamshoro district near sann

detailed location info from wikipedia
"Ranikot Fort is 90 kilometres (56 mi) to the north of Hyderabadon the national highway. There is also an easy access of about an hour's journey from Karachi to Sann on the Indus Highway. A diversion road, starting a little distance away from Sann, the nearest town, leads to the fort along a rugged 21 kilometres (13 mi) road and reaches the eastern gate of the fort, known as Sann Gate."
*location info from wikipedia*

it's orignal construction is uknown but present structre is constructed by 'Talpurs' and the repaired and renovated by many goverments.
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worlds largest fort Rani kot fort 2nd longest wall, the great wall of sindh