Most people visiting St Austell will know a thing or two about its headline attraction, the Eden Project. It hardly needs much by way of introduction. Its iconic pair of giant biomes are one of the most recognisable attractions in the UK. Step inside the larger of the two and you’ll be transported from sunny St Austell to the humid rainforests of the Amazon. Meanwhile, the smaller of the pair simulates more of a Mediterranean environment. Between them, they hold nearly two million plants of more than 5,000 different varieties.