The Eden Project is a visitor attraction 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 2 kilometers (1.25 mi) from the town of St Blazey and 5 kilometres (3 mi) from the larger town of St Austell, Cornwall. The complex comprises a number of domes that house plant species from around the world, each dome emulating a natural biome. The domes are made out of hundreds of hexagons plus a few pentagons that connect the whole construction; each of these is a transparent cushion made of tough plastic. The first dome emulates a tropical environment, the second a warm temperate, 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.