Headstone Tunnel

Not sharp. Only a phone snap. I quite like it anyway. The tunnel at Monsal Head, Derbyshire. 490m long.
The old railway line has been turned into a fantastic bike/walking trail, with the many tunnels lit and surfaced. Such a good - and very popular - use of a line which fell foul of Dr Beeching's report. It would have been a pity not to use this line in particular, with all the man-hours, not to mention lives, that went into creating it, only to be disused.