What Pidurangala is – a monastery in caves or an ancient Over-the-Horizon Early Warning Radar next to the Sigiriya "Lion's Rock"?
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There is an unusual "bald" granite mountain at exactly 1 km distance (by centers) to the rocky plateau of Sigiriya, with flat inclined top of triangle shape, as if it were cut obliquely by the giant knife.
There is a monastery in caves of the Pidurangala Mountain, quite a big cave complex. Though the walls of the caves have been reconstructed the tell-tale signs of early civilization are evident. The face of the rock is carved to form grooves to prevent rain water from directly falling onto the caves. Furthermore, a rock inscription written in early Brahmi script links the cave to Lord Pussa and has been dated to 3 BC - 1 BC. This proves that the caves at Pidurangala were inhabited prior to King Kashyapa's era.
Here's how it looks like from the top of the rock of Sigiriya: