Middleton Mine (Christmas Edition) - Derbyshire
An underground Limestone quarry spanning over 35 Kilometers.
Ogof Gofan Sea Cave - Pembrokshire
A remote sea cave on the Pembrokshire coast, home to some of the best cave formations in the UK.
Chatterley Whitfield Underground Experience - Staffordshire
A former underground coal mining museum.
Sallet Hole - Derbyshire
A mixed-mine that had been worked for lead, barytes, and fluorspar, closing in 1998.
Rhosydd Slate Quarry - Blaenau Ffestiniog
A 19th-century slate quarry, known for its extensive underground workings and rugged mountain setting.
Milldam Mine - Derbyshire
The last working mine in Derbyshire known for producing Fluorspar.
Oxlow Cavern - Castleton
A part natural, part mined cavern in Derbyshire. known for its impressive size and connecting systems.
Water Icicle Close Cavern - Monyash
Water Icicle Close Cavern in Derbyshire is a mix of natural cave passages and old mine workings, known for its formations and a deep entrance shaft.
Hanging Flat Mine - Stoney Middleton
This small Derbyshire mine, worked for lead and later fluorspar until 1987, was briefly used for a 1992 "Peak Practice" episode (leaving polystyrene boulders).
Foel Grochan - Aberllefenni
Part of the longest continually operated slate mine in the world until its closure in 2003.
Slate Quarry Drainage Level - Wales
Serving as a drainage channel for a popular Welsh quarry.
Holme Bank Chert Mine - Bakewell
a key Derbyshire chert source active from the 1800s to 1961.