From Birmingham and North - M5 South.
Leave at Junction 8 and continue on M50 to Ross on Wye. Take A40 to Abergavenny. At roundabout take second exit onto A465. Leave A465 at first exit and follow signs to Blaenavon and "Big Pit".

From London and South West - M4 West and leave at Junction 25A (Newport).
Take A4042 as far as Pontypool. At roundabout (McDonalds Restaurant) take first exit and follow A4043 to Blaenavon.

From Crickhowell?