The National Botanic Garden of Wales opened in May 2000 and was the first botanic garden of the new Millennium. It is built in 568 acres of Regency parkland. The Great Glasshouse is an impressive piece of architecture and the largest single span glasshouse in the world. It contains zoned collections of some of the most endangered plants from Australia, California, The Canary Islands, Chilie, The Mediterranean Basin and South Africa. The unique and historic Double Walled garden traces the evolution of flowering plants. The garden boasts the longest herbaceous border in Europe. There is also a bog garden, bee garden and children's farm.