http://www.visitscotland.com/en-us/info/see-do/gilmerton-cove-p548731
https://en.wikipedia.org/wiki/Gilmerton_Cove
Secrets below the streets of Edinburgh
http://www.scotsman.com/lifestyle/secrets-below-the-streets-of-edinburgh-1-466247
Grail hunting time!
“The other is said to head straight to Rosslyn Chapel only a few miles away.
With the revelation of secret passageways - or escape routes - theories topple over each other like dominoes. Into the already heady mix of masons, witches and Covenanters comes more fanciful notions. Echoing around the caves is a distant whisper of a deep and hidden mystery. It is said that the Knights Templar - those fighting Crusader monks - used this place for assignations, entering secretly through the tunnels that run back to Rosslyn.
And as everyone knows by now, the Templars didn’t just bring fighting talent when they came out of the East, but something else. Which leads to one final question about Gilmerton.
Could this neglected, half-forgotten cave be the true resting place of the Holy Grail?”