Summary: The view is spectacular, but the ground is an awfully long way away.
The view from up here was spectacular; mountains, valleys, forests and plains stretching as far as the eye could see to a far-distant, greenish ocean. Martha leaned on the terrace balustrade and peered downwards before taking several very hasty steps backwards.
“Whoa! That’s a long drop. How high are we?”
The Doctor leaned out over the edge at an angle that made Martha want to grab him and pull him back. “Oh, not all that high really, five or six miles, maybe a bit more. Hard to be exact; the ground’s uneven.”