there is a temple complex at Sigiriya in Sri Lanka. The site is ancient and was developed by Kasyapa in AD473. It is situated in the 'Cultural Triangle' near to Polonnaruwa.
There are two slabs on the site, one referred to as the 'Kings Throne' and the other is described as a 'mirrored wall' situated below some frescoes.
There is a Sunday Times (UK) article about the place but I can't remember when it was published.