Open to the public only one day a year, the Garden of Cosmic Speculation takes science and maths as its inspiration. Quite simply, there isn't another garden like it in the world. The garden was set up by Charles Jencks, together with his late wife Maggie Keswick and is located at Portrack House near Dumfries. That's in Scotland, by the way! It was set up in 1989 without the usual ideas people have when they create a garden. Horticultural displays very much take second place in this garden. Instead, it is designed with ideas in mind - and to provoke thought (or at least speculation) about the very nature of things. (Source)
Keukenhof Gardens – The NetherlandsAn unprecedented wealth of spectacular floral displays planted in endless varieties, alternated with beautiful works of art. Keukenhof is unique, world famous and has been one of the most popular destinations in the Netherlands. The garden is home to 7 million tulips, which includes special hybrids that have been or are being developed. In fact, Keukenhof's pride and joy is the truly awe-inspiring Russian black tulip Baba Yaga. (Source)
Suan Nong Nooch – ThailandThis incredible park is situated in Pattaya, Thailand. It is popular among tourists because of stunningly beautiful landscapes and marvellous views. Everything there seems to be from a fairy-tale. It is full of Thai style houses, villas, banquet halls, restaurants and swimming pools. A vast 600 acres area was bought by Mr. Pisit and Mrs. Nongnooch in 1954, this land was predicted to be a fruit plantation, but, Mrs. Nongnooch made a trip abroad and came back with a firm decision to create there a tropical garden of ornamental plants and flowers.