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The Princess of Wales Conservatory, designed by architect Gordon Wilson, was opened in 1987 by Diana, Princess of Wales in commemoration of her predecessor Augusta's associations with Kew. It replaced 26 smaller buildings.  In 1989 the conservatory received the Europa Nostra award for conservation.The conservatory houses ten computer-controlled micro-climatic zones, with the bulk of the greenhouse volume composed of Dry Tropics and Wet Tropics plants. Significant numbers of orchids, water lilies, cacti, lithops, carnivorous plants and bromeliads are housed in the various zones. The cactus collection also extends outside the conservatory where some hardier species can be found. The conservatory has an area of 4,499 square metres (48,430 sq ft; 0.4499 ha; 1.112 acres). As it is designed to minimize the amount of energy taken to run it, the cooler zones are grouped around the outside and the more tropical zones are in the central area where heat is conserved. The glass roof extends down to the ground, giving the conservatory a distinctive appearance and helping to maximize the use of the sun's energy. During the construction of the conservatory a time capsule was buried. It contains the seeds of basic crops and endangered plant species and key publications on conservation.