Ratnagiri Fort - Credit: Wikimedia Commons
Ratnagiri Fort is a hill fort located in the Ratnagiri village near Rolla, in Sri Sathya Sai district of Andhra Pradesh, India. Located near the border of Andhra Pradesh and Karnataka in the Rayalaseema region, it is also known as Seema Golconda ("Golconda at the border"). The Government of India has designated it as a Monument of National Importance. Read more on Wikipedia
Source: en.wikipedia.org