Over the weekend Mr Barilaro joined in on the celebrations, marking 40 years since the Chalet opened its doors.

Mr Barilaro said the chalet has brought countless smiles to the faces of around 40,000 sick and disadvantaged children over the past four decades.

"For many children who have stayed here it has been a tough road but the Castle offers them the opportunity to just be a kid and put all their worries behind them.

"Countless dreams and friendships have come to life at this special place," Mr Barilaro said.

Mr Barilaro also took the milestone as an opportunity to say thank you to the volunteers from the Apex Foundation.

More than five hundred volunteers helped build the Chalet and each year give up countless hours to look after and manage it.

"As a father of three myself it warms my heart to see the smiles this castle brings to children. Those smiles are only there because of the hard work and dedication of the volunteers from the Apex Foundation.

"The NSW Government supports the work of volunteers across the state and the work of Apex members has changed so many lives for the better," Mr Barilaro said.

APEX Foundation Director Jamie Vincent said he was very excited to welcome Mr Barilaro to the Magic Castle and to celebrate the important milestone.

"To provide underprivileged children the opportunity to visit the most pristine environment in the country is very special.

"What we do is indescribable, we are very thankful to the many volunteers who support us and the companies who donate to the cause," Mr Vincent said.

The Chalet was opened in 1979 by then Prime Minister Malcolm Fraser.