The Temple of mercury was built by Sir Edward O’Brien (a noted horse breeder). O’Brien had gambled the entire estate on one of his horses at Newmarket, the racing centre in England.The horse (Sean Buí) won the race and saved the family fortune and was glorified by being buried beneath the temple some 100 yards from the old entrance to the Castle. It is capped by a copy of Giambologna’s statue of Mercury.

On the Lakeside note the Douglas Fir tree avenue, on the Castle side note the Lime Tree avenue, on the Lily Pond side note the Yew Tree avenue and toward the paddocks note the Conifer tree avenue.