Located in a dramatic setting of mountains and sea, this is one of the most outstanding tree and shrub collections in Europe. The beauty, vigour and perfect shape of the trees in the National Arboretum attract tree enthusiasts from around the world. However, Castlewellan has numerous features that draw wider attention. The garden is a mixture of informal and formal design with terraces, fountains, ornamental gates and flower borders. To walk around the forest park's mile-long lake, encountering some intriguing modern sculptures on the way, is to enjoy a great experience of eighteenth-century landscaping.