I

n the middle of a disused clay pit in Cornwall, five giant bubbles lie wedged in the ground. They are the Eden Project’s ‘biomes’ – massive greenhouses containing thousands of the world’s plant species within their iconic, slightly steamy walls.

While the Mediterranean biome takes you on a road trip, from the olive trees of Europe to California, the hotly anticipated Rainforest biome awaits next door. A huge waterfall tumbles in the background as you walk through Tropical South America, West Africa and Asia, alongside the trees and plants responsible for keeping the world cool.

Next, head up to the new 165-ft jungle canopy for a spectacular view, which at 90% humidity, is not for the faint hearted.

And a quick tip to whoever’s paying the bill: arrive after 3:30pm on foot, bus or bike, and you’ll get reduced admission – and crowds – to what is one of Britain’s most impressive eco-attractions. Money aside, this is a must see.