I'm having second thoughts. The steep stone path we've been slowly climbing for the last half-hour has disappeared and we're standing on a small section of terracing with terrifying thousand-metre drops on three sides.

Maybe this wasn't such a good idea. Perhaps we should have heeded the advice of the security guard who told us not to carry on.

Suddenly, Rob (the only other person on the tour foolish enough to attempt this with me) spots a small arrow pointing into what appears to be a sheer rock face.