The National Orchid Gar d en is a part and the main attraction within the Botanic Gardens of Singapore. Located on the mid-western side of the Garden, the hilly three-hectare site has a collection of more than 1,000 species and 2,000 hybrids of orchids. The Singapore Botanic Gardens is a 158-year-old tropical garden and is one of three gardens, and the only tropical garden, to be honored as a UNESCO World Heritage Site. As early as the 1870s, an Orchid House was established