Kota Gullu is a group of ruined 12th-century Kakatiya temples near Ghanpur. The complex is damaged, but the surviving stonework still shows the ambition and detail of Kakatiya temple architecture.
It is best treated as part of a wider Warangal-area temple circuit, especially if you are already heading toward Ramappa Temple. Go for the atmosphere of the ruins rather than expecting a polished museum site.