Regarded as most popular Buddhist site in the country, Phanigiri is situated about 52 km from Nalgonda town. The place comprises of a Buddhist complex which is adorned with a massive Stupa along with two apsidal halls with stupas in it.
Two large footprints in the complex are believed to belong to Lord Buddha. The place also houses three viharas which were once served as the dwelling for the Buddhist monks. The viharas lies on the hilltop called Serpent's Hood Hill deriving its name probably from its shape.