Eden Project

Stand at the rim for a moment and listen. Far below, the gravel paths crunch under hundreds of feet, and somewhere a waterfall runs steadily behind a wall of glass-like bubbles. The air up here smells of damp Cornish earth and cut grass. Then you look down into the bowl, and the giant domes come into view. They sit against the slope like a cluster of soap bubbles that someone forgot to pop.

Welcome to the Eden Project, a few miles outside the town of Saint Austell in Cornwall. Before the gardens, before the domes, this ground was a working china clay pit. China clay, also called kaolin, is a fine white mineral used to make porcelain, paper and paint. For generations, this part of Cornwall dug it out of the earth. Look at the steep walls around you. Those curved slopes are the shape left behind by industry.

Here is the first surprise. When the project began, there was almost no real soil in the pit. Clay workings leave behind sterile ground, not the rich earth that plants need. So the team made soil. They mixed waste from the clay industry with composted material to create a growing medium from scratch. Every tree, vine and flower you see today grows in earth that people built on purpose. Eden is a garden, but it is also a repair job on a scarred landscape.

The idea came from Tim Smit, who had already helped restore the Lost Gardens of Heligan, not far from here. He wanted a place to show how much human life depends on plants. The architecture firm Grimshaw designed the domes, and the site opened to the public in 2001. Funding came partly from national millennium money, at a time when Britain was building many large projects to mark the new century.

Now look closely at the domes themselves. They are called Biomes, and their skin is not glass. Each panel is a pillow made of a thin, tough plastic called ETFE, which is inflated with air. The panels are mostly hexagons, with some pentagons mixed in, held in a light steel frame. The material weighs far less than glass and lets ultraviolet light through, which the plants need. Here is the second surprise: those huge panels contain mostly air.

Why domes, and why bubbles? The pit was still changing shape while the plans were drawn up, and a rigid building would not fit uneven ground. The geodesic design, a dome made from many small flat shapes, can sit on curved land and follow it. Designers say the soap-bubble idea came from this need. Bubbles meet each other neatly wherever they touch, and so the Biomes join each other along the slope.

Step inside the Rainforest Biome and the change hits you straight away. The air is warm and wet, and your glasses may fog for a minute. Eden describes this as the largest indoor rainforest in the world. Paths climb up through plants from tropical regions of South America, Africa and Southeast Asia. You will find bananas, cacao for chocolate, rubber trees, and bamboo that grows quickly toward the roof.

The Rainforest Biome is not only a jungle display. It also tells the story of people who live in and around rainforests. Look out for small homes, gardens and crops from tropical communities. A raised walkway carries you high into the canopy, and a lookout platform near the top lets you see the whole dome from above. It is hot up there, so take water. The heat rises, just as it does in a real forest.

Next door, the Mediterranean Biome feels completely different. The air is drier and cooler, and it smells of herbs, warm stone and citrus. Here you find plants from places with hot summers and mild, wet winters — the Mediterranean itself, but also South Africa, California and parts of Australia. Look for olive trees, grapevines, lemons and fragrant shrubs. Many of these plants feed us every day, though we rarely stop to think where they grow.

Outside the domes, much of the site is open-air garden. These outdoor beds hold plants that grow well in the Cornish climate, which is mild by British standards. You will find crops like hemp, tea and plants used for medicine and fibre. In spring and summer, the slopes fill with colour and the sound of bees. Walk slowly here. The outdoor gardens often get less attention than the domes, but they hold many of the best small stories.

Then there is the Core, the education building with a curved wooden roof. Its design follows the spiral pattern found in sunflower seed heads and pine cones. Botanists call this arrangement phyllotaxis, the way plants arrange leaves and seeds in efficient spirals. Inside sits a large granite sculpture called Seed, made by the artist Peter Randall-Page. Its surface carries a pattern of raised bumps that follows the same natural spiral as the roof.

Eden has also become a place for big gatherings. In 2005, it hosted a concert linked to the Live 8 campaign. Musicians perform in the pit during summer concerts, with the domes glowing behind the stage. The site has also appeared on screen, including in a James Bond film in the early 2000s. In winter, events and lights can change the mood of the whole bowl. The same clay pit now holds music, families and school groups.

Before you leave, stop again at the rim and look back. Think of the white clay that once came out of this hole, and the soil that people carried back in. Watch the light move across the domes as clouds pass over Cornwall. Notice the sound of the paths and the smell of the earth. As you walk up toward the car parks, you are leaving a quarry that people turned into a garden, one plant at a time.