The Welsh-born actor promised the money to one of Britain`s main conservation bodies, the National Trust, which plans to raise more than three million pounds to buy two estates on the mountain. "Snowdonia is one of the most beautiful places in the world and Snowdon is the jewel that lies at its heart. It must be cherished and protected," Hopkins, who is also president of the National Trust Snowdonia Appeal, said in a statement. "The National Trust is dedicated to the preservation of this land and its natural heritage... I am very pleased that I am able to offer this support." Hopkins will visit the mountain at the end of August, the trust said. Richard Cuthbertson, chairman of the National Trust`s Committee for Wales, said the trust was "totally overwhelmed" by the gift.