It might look like bubble wrap nestling in a crater, but the Eden Project’s biospheres house plants from warm temperate regions right through to the tropics in an amazing walk-through experience which aims to promote a better understanding of sustainability, and the way we interact with the natural world. One of Britain’s landmark Millennium projects, it’s more than just a high-tech botanical garden - it uses art, storytelling, workshops, lectures and events to put across the message.