From the Bahmani Sultanate...!

Ruins of The Bidar Fort, built and once ruled as a branch of Kakatiya Kingdom, later taken over by Mughals of Aurangabad, local Bahmanis (for the majority period), AsafJah's of Gulbarga and finally by the Wadiyars of Mysore.
Rich architectural beauty built in the 12-13 centuries, full of Persian Architecture with wise underground water management system (Karez), huge beamless structures and intelligently designed / planned security practices.
Thanks to the superior stone-mortar combination for being able to keep alive the antiquity for centuries, in-spite of the invasions by the yesteryear ambitious emperors and current day wall  scribblers.
A Must-Visit for the Heritage and archaeology lovers.