Tango Monastery
Tango Monastery is a Buddhist monastery 12KM north of Thimphu, Bhutan. It was founded by Lama Gyalwa Lhanampa in 12th century and in 1616 the Tibetan, Shabdrung Ngawang Namgyal, meditated in its cave.
There are five temple buildings in the complex. One of the five temples housed stones,
which contained imprints of the footprint of Guru Rimpochey and the hoof of his horse.
Another holy relic was a black stone looking box that contained a key -
Passing along the valley road, we saw a large gold painting of the Guru Rimpochey, painted onto the rock cliff face. Supposedly if you have a dispute or court case pending and pass the picture at midnight then you will find out what the outcome of your dispute will be. If the road is pitch black and you can see nothing then the outcome will be against you, however if the road is lit up in all directions with light emanating from the picture, then the outcome will be in your favour.
Web site for a short history of Tango Monastery
http://himalaya.socanth.cam.ac.uk/collections/journals/jbs/pdf/JBS_02_01_05.pdf