The Cave of Mangueshi, a small single cell rock-cut cave, is located 1 km from Mangueshi in Ponda taluk of North Goa District. The cave has neither pillars nor verandah, but there is a square lateritic pitha with a yoni which is intended to insert shivlinga. It is assumed to be a shivalaya belonging to the 5th century.

Source:

http://www.india9.com/i9show/The-Cave-of-Mangueshi-51514.htm