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Photo: Chris Allen, CC BY-SA 2.0 via Wikimedia Commons
China clay mining museum, with various exhibits of the extraction process.
The Wheal Martyn China Clay Museum is a museum of china clay mining, at Carthew, on the B3274 road about 2 miles (3.2 km) north of St Austell in Cornwall, England. A Victorian clay works has been preserved, and there is an exhibition building.
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Spectacular rehabilitation of an old china-clay pit. Full of plant life, the star attractions being the two "biomes": one tropical rain-forest habitat, one Mediterranean, housed in vast transparent hex-domes, like Xanadu in galactic bubble-wrap. Impressive if a tad eco-preachy, plus lots of merchandising and theme-park stuff (eg "Hangloose", a long zip-wire ride over the site), which it's easy to swerve. They hope to build a third biome, for desert life, when finances allow. There's also a YHA on site, see "sleep".
Mostly aimed at younger children. With adjacent retail park.