They carried out extensive planting of trees and ornamental shrubs, laid paths, constructed river bridges and opened the site to the public in 1867.

[3] Today a variety of mature and impressive trees including sequoia, thuja, spruces, Douglas fir, oak, sycamore and beech can be seen.

[4] The national glen of an area of 67 acres and associated buildings were purchased by the Isle of Man Forestry, Land and Mines Board in 1958 for a cost of £4,300.

[5][6] The Glen Helen section of the A3 Castletown to Ramsey road was part of the St John's Short Course used for the Isle of Man TT races between 1907 and 1910.

[7] The Glen Helen section of the A3 Castletown to Ramsey was also part of the 37.50 Mile Four Inch Course for the RAC Tourist Trophy automobile races held in the Isle of Man between 1908 and 1922.