Nearest cave to.......

[kay]

Caving friends found an old well inside the Yorkshire barn they converted into a house so, after abseiling it (its only about 20ft to about 3 ft of water),  they put lights in and topped it with thick glass - very surreal to walk across an illumiated void in someone's living room!

I remember being in a house in Kent where they'd done the same to the stream that flowed under their living room. Not just an illuminated void, but fish too!

 

[paul]

My previous house in Brassington, Derbyshire had a well in the garden about 5 feet away.

Even better, there's a house in Middelton by Wirksworth, Derbyshire has a mine passage accesible from within the house, in one of the walls. The owners have put a glass panel over it and made it into a feature.

Sat here in the living room, also in Derbyshire, there's a mine adit into an old lead mine less than 100 feet away, but it's in a neighbour's garden...

 

[robjones]

So - not just an entrance on your doorstep, it's an entrance you have to pirate...