Asigarh — "the fort of swords" — is a great earthwork-and-brick mound rising above the modern town, enclosing about thirty acres. Legend places its founding under Prithviraj Chauhan in the twelfth century; the swords forged here were traded as far as the Arab world, which gave the place its name and, by extension, gave Hansi its older designation as "Asi" (sword) Nagri.
What you see today is mostly ruined: stretches of rampart, the foundations of inner buildings, a stepwell, and the surviving entry gateway built by George Thomas around 1800. The Archaeological Survey of India declared it a Monument of National Importance in 1937 and the site is freely accessible. Climb the rampart for a view across the old town and out over the Haryana plain.