The Eden Project is a visitor attraction in Cornwall in the United Kingdom, including the world's largest greenhouse. Inside the artificial biomes are plants that are collected from all around the world. The project is located in a reclaimed Kaolinite pit, located 1.25 mi (2 kilometres) from the town of St Blazey and 5 kilometres (3 mi) from the larger town of St Austell, Cornwall.
The complex is dominated by two huge enclosures consisting of adjoining domes that house thousands of plant species, and each enclosure emulates a natural biome. The domes consist of hundreds of hexagonal and pentagonal, inflated, plastic cells supported by steel frames. The first dome emulates a tropical environment, and the second a Mediterranean environment.
The project was conceived by Tim Smit and designed by architect Nicholas Grimshaw and engineering firm Anthony Hunt and Associates (now part of Sinclair Knight Merz). Davis Langdon carried out the project management, Sir Robert McAlpine and Alfred McAlpine did the construction and MERO designed and built the biomes. Land Use Consultants led the masterplan and landscape design. The project took 2½ years to construct and opened to the public on 17 March 2001.