The Royal Botanic Garden Sydney is a major botanical garden located in the heart of Sydney, Australia. Opened in 1816, the garden is the oldest scientific institution in Australia and one of the most important historic botanical institutions in the world. It is open every day of the year and access is free. Its stunning position on Sydney Harbour and immediately adjacent to the Sydney CBD, the Sydney Opera House and the large public parklands of The Domain ensure it is one of the most visited attractions in Sydney.